1990 300zx engine replacement

[Duke51]

Hey everyone so I recently found out in the process of disassembling my engine that it is much worse than I originally thought due to this I have decided to just replace the engine as a whole or at least the block, crank, pistons etc... Why I am looking to replace the whole engine is because I've done some calculating and have summed up that it's cheaper than trying to buy all the parts, maybe I'm not looking in the right areas but still I'd like to keep prices as low as possible. I haven't had a whole lot of luck with craigslist in my area and I'm not sure how much I trust EBay. I've looked into buying an import and have found that Tiger Japanese Imports have the lowest price, so here's my long drawn out question; has anyone else bought an engine from this company? If so would you recommend them? What is customer service like etc...? Another question I have is does anyone know of a better place? or have an engine they are willing to sell? I'm looking for an NA 1990+ preferably low miles with no mechanical problems. Any and all help is welcome. Thank you.