| +1 to hunta's suggestion.
If you really want to stick with cassette, I've seen quite a few used double decks on craigslist and in some of the older pawn shops around here recently. They were priced very low, like $10 or $20.
If you still have a functioning single well deck, or find two for sale, you could also just record from one to the other with a common RCA cord.
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