I got very lucky on eBay.
I have a backwards compatible PS3, And i have 4 memory cards for PS2/1
My PS3 is now my PS2/1 and I have been looking for a way to transfer my old saves.
The adapters go from $45-$50, and that is steep for a thing I'm only going to use once. I debated buying one and selling it, but was on the fence just in case I needed one in the future, and it is a good thing to keep with the system.
I have been sitting on it for a while, and I just decided to take another look because the one in my cart sold.

New, $7.00 + $3.65 shipping. New listing with 5 views.

Instant buy.
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I also have one of these got it back when they were new in shops