I agree, it's not an exorbitant amount of money. I sell Aoshima's RB20DET:
http://www.tigersdenhobbies.com/stor...ategory_id=254
For the same cost ($20.99 cdn or like $18 usd). Of course mine's based on manufacturer's suggested retail price though.
If you're looking for a retailer to maybe sell your engine kit in greater numbers, let me know