swaps can be had through many sources but some people only get motors sometimes.

xat gets motors apparently but they only get them if they do the install so you cant just buy a motor from them. alot of shops get them from a higher source anyways.

enjuku and heavythrottle carry engines, project silvia does, shop in NC (forgot name), individuals in miami and tampa do as well. almost any shop that imports motors CAN, but the shops that specify in them like enjuku, HT, PS will give you the best deals and usually know what kind of shipments they get and such.