I have collected all cars myself, so I dont want any cars traded

I'm "that guy"
Well then out of your list, you can buy the cars noted at the dealerships and the rest you'll have to wait until they come up in the Used Car dealership, if you do not want to trade or use tickets:
S Acura HSC Concept ’04 -
UCD ~750K
S Chaparral 2D Race Car ’67 -
UCD ~12M
S Dodge Viper GTS-R Team Oreca Race Car #91 ’00 -
UCD ~2M
P Ferrari 330 P4 Race Car ’67 -
New $20M
P Ford Mark IV Race Car ’67 -
New $20M
P Gran Turismo Red Bull X1 ’10 -
Get one at Lvl 35 B-spec; Buy one new at Lvl 40 A-spec
S Jaguar XJR-9 LM Race Car ’88 -
UCD ~4.5M
S Mazda RX-8 Concept (Type-I) ’01 -
UCD ~65K
S Mercedes-Benz Sauber Mercedes C9 Race Car ’89 -
UCD ~5M
S NISMO 400R ’96 -
UCD ~118K
S NISMO Skyline GT-R R-tune (R34) ’99 -
UCD ~124K
S NISMO Skyline GT-R S-tune (R32) ’00 -
UCD ~89K
P Nissan 370Z Tuned Car ’08 -
Tickets
S Nissan MOTUL PITWORK Z (JGTC) ’04 -
UCD ~700K
S Pescarolo Sport Pescarolo-Courage – Judd GV5 Race Car ’04 -
UCD ~4.5M
S Peugeot 905 Race Car ’92 -
UCD ~4.3M
S Spoon FIT Race Car ’03 -
UCD ~ 50K
S Tom’s X540 CHASER ’00 -
UCD ~ 50K
Also, check the Online Car Dealership for some you might not have. 👍