Are there specific parts or brands you want? I normally buy direct from the manufacture, stunt companies are small and all of them sell direct to end user....I find it easier to get what you want rather then trying to buy it all from one supplier, where you have to wait for answers to go through 2 people and then wait for the supplier to get all your parts in stock before they ship.....Had a problem with one of these stunt shops back in the day where it took months for them to fill an order because one part didn't come in...Instead of giving options to ship what they had they just waited months and months....For that reason I deal with the companies direct now, and with most of them they are so small you are actually talking to the person that is going to make your part....Ive bought so much over the years some of them know me and give me the same prices I would get from a dealer or even better discounts, I have a really good relationship with RSC, he has given me huge discounts and even a completely free stunt clutch lever. For pegs and stuff like that 50stunt is the man, that guy runs his business 100% on point.....If you need tank fabrication Graveyard just did 2 for me and he also runs his business proper...Communication and service is top notch from those guys
Off the top of my head I will list a few of the parts manufactures that sell direct that I by from
PMPsprockets
50Stunt
fullthrottleinc
HoheyDesigns
Graveyard custom tank fab
Sickinnovations
righteousstuntmetal (RSC)
If there is something specific you need, post up and people can give you advice on that specific part weather it be where you buy or what brand to buy