From the AMA NATS Registration page:
Session Fees
301 1/2A Speed - $10.00
302 A Speed - $10.00
303 B Speed - $10.00
304 D Speed (SA) - $10.00
305 1/2A Profile Proto - $10.00
307 21 Sport Speed - $10.00
308 Formula 40 Speed - $10.00
309 Jet Speed - $10.00
310 F2A - $10.00
NASS 21 Profile Proto Unofficial - $0.00
NASS Fox Speed Unofficial - $0.00
NASS Perky OTS Unofficial - $0.00
NASS Sport Jet Unofficial - $0.00
21 Proto is still on the books as an AMA event, for those who might want to run for the record.