Best place and all the implied questions depend on what exactly what you need for control line

Hobby King
Norvel
Randy Smith
Brodak
Tower
Hobby people
 and a dozen other places

Readily available engines are mostly RC with a carb but most of the time the timing and power are just fine for most C/L use converting to venturi and good NVA

Combat, Stunt, Carrier

Not trying to be a wise ass as you read and post quite a bit here on SH so I assume you know most of what I noted above

IN the last 12 months are so many threads on SH about the loss of NEW IN BOX control line engines. In each thread are suggestions ranging from converting OS, and Hobby King engines, to sourcing Horizon Hobby Evolution .36 .40 .46 .60+ or type built RoJet, PA, Stalker engines

I got back into CL three years ago (or is it four)  and have very few NIB engines .25 to .36/,40 sized but have amassed over 50 very good to near perfect good used engines from these forums and e-bay ( most of the 50 are Cox .049 .051 .09 .15 sized)

Just today I paid $40 for a near new (run but never flown) Fox .35....destined for the nose of a recent built RingMaster

Some of my e-bay OS FX .25 and LA 25s and my Fox .36 MK series get new NVAs and or venturies from Randy Smith, Erik Rule (RSM) and Lees Machine Shop... I also find good parts from e-bay Omni models and Shttrman

MECOA now sell a K&B .28 for $89 reported to be a good engine... and vendor here sells them also
I have had good luck with Norvel and the Hobby King ASP/Magnum china made knock off of mostly OS designs

Takes a bit of perseverance buy Ken Enya still makes damned good C/L engines and many used ones are on e-bay usually barley broken in and some sizes still have good repair parts availability from Shttrman and Omni


So Brother beercamel what are you looking for?

Need a combat screaming engine? Henry Nelson did a recent (2014) run of the N.36c and they are all (93)  in private hands but occasionally found for sale

Since size wasn't mentioned, there are Cox offerings from
http://coxengines.ca/
http://www.exmodelengines.com/

sadly mostly reed cox engines are what is available.

Fine NVA's can be had through Texas Timers
http://texastimers.com/

Phil

The best places to buy CL engines:
CL Contests, (look for the guy with a card table selling off his stuff)
CL Club Meetings, (buy raffle tickets)
RC Club Meetings/Flying Fields (ask the oldest flyers what they have for sale/trade)
MECA Swap Meets, (GOLD MINE),
Etc. 

The best places to buy CL Venturi's:
Lee Machine Shop (extensive offering)
Ebay (seller name shtterman, and others)

The best places to buy CL NVA's:
RSM Distribution (Eric Rule)
Precision Aero (Randy Smith)
Tower Hobbies (OS brand)

Guys who will make a Venturi, install it and test your engine:
Master Mechanic, CL Racer, and my buddy: Jed Kusik, 714-669-0205
TYME (test your model engines) Scott Riese, 503-246-4631
There's another guy too, he runs a forum, but not this one...

If you know what you need you can post a wanted ad and sometimes multiple people will fight over the opportunity to be that one guy that provides you with parts.

How's that for a start?

Thanks;..  These are new sources for me!..    I have already ordered from Lee Machine shop and Ebay.. About Lee's MS..  I could NOT give a better recommendation!  Friendly fast service!!


I may be just missing the old days when the was a huge selection of C/L engines.. even at the local hobby shops..   I have converted a K&B .40 to a C/L engine..  but its just seems 'Half Fast' to me.. there is a hole where the exhaust baffle was.. and it sure does NOT feel like it ran as hard as my old K&B .40's made for C/L.. 

Do any of the guys fix old K&B rear rotor C/L engines?

Technohobby is just such a gold mine: http://technohobby.com.ua/online-shop/en

Also Club Tamaran: http://www.control-line.eu/

Also PlanetHobby.com

And Hobbyclub.com

Planet Hobby, NovaRossi engines.
http://www.planethobby.com/

The best places to buy CL engines:
CL Contests, (look for the guy with a card table selling off his stuff)
CL Club Meetings, (buy raffle tickets)
RC Club Meetings/Flying Fields (ask the oldest flyers what they have for sale/trade)
MECA Swap Meets, (GOLD MINE),
Etc. 

When you say MECA swap meets where are they? I use to go to one in Columbus OH in the early 90s but I talked to a MECA guy recently an he said there are no shows anymore.

i probably have the parts to fix your K&B 40

I was shown a new product, current production, although diesel.  I never heard of them before a few days ago.

http://www.redfinengines.com/

Phil

Light on specifications, and too small for stunt if I'm reading their numbering system correctly.

But kewl engines for sport free flight, and (given that I'm a total ignoramus in the field) team race.

.........35/.36 for stunt ..

Try a Rustler Merco Metamorph 40 from Ian Russel AKA Rustler on the forums.

Its a baffle top piston engine with a modern take and in production.