Taking into account: price, low mileage, good condition, warranty if possible.
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There are some companies that sell a few engine swaps on ebay. If you go there now I’ll bet you’ll find some. Some of these companies are regulars on ebay and as soon as a swap is auctioned off they’ll put another one up. I would find a company auctioning one off and find out all you can on that company then if you like what the swaps are going for, they have good customer service and the shipping isn’t too outrageous start bidding until you get one. I would probably recommend calling them a few times before you start bidding to talk to people that work there to see what kind of CS they have. You should be pretty safe with the regulars on ebay. Good luck