Nino, you have changed my mind. I will send these guys a email and give them a go.
( i have to admit however, I do like the pretty pictures and marco website for ease of use, but as u say, u cant be lazy forever or u might miss out on needed parts at great prices, which suits me).
I do have a factory manual for every machine so finding parts numbers is easy.
I am hoping they might stock Data East/Sega and Bally/Williams etc as well. If they do, that will be good for their pocket, and hopefully good for my pocket as well. 
Brett - You have the manuals for each game you own and that's half the battle with PBR. Simply quote the game and part number. Compare against other suppliers in the USA. I just ordered US$700 worth of parts and it took me two emails. Ordering from manuals etc also educates us on the parts etc.
Good to hear that you are giving it a go.
RTBB sell some GTB parts and the prices are more than fair for people who need common parts locally
