for serious, price is all relative to reputation of motor sorce and condition of product. I could have an rb25 with cracked cylinder walls, blown head gasket and bent valves, not tell you, charge you 500 for a full swap and youd be giggling like a little school girl till you either tore it down to bare block or tried to start it up and had coolant every where. compare prices of different reputible sorces, and then make your decision. RESEARCH is something a lot of new comers and little kids fail to do, and is something that can get you a lot of respect not just from me (not that that matters) but from a lot of the real knowledgeable Nissan guys.