I have shopped around Ebay and have not seen an identical one for $5 or less than $20. However, that was one day of intensive searching. perhaps there just weren't any available that day.
I saw a few that claimed "terminated" in the subject line, but an examination of the photo clearly demonstrated a lack of components that would provide termination. Now, it could be that they're using a stock photo instead of an actual photo, but it seems more likely to me that they just copied a title they saw somewhere and pasted it on their item and don't actually have any idea what termination is or means.
Most of the SCA adapters on Ebay don't appear to support termination. Many of the SCA drives available don't have provision for on-board termination.
There is also a $5 adapter on Amazon, and again, the photo of the item clearly lacks components to provide termination, even though the item title claims termination.
If you see one ($5 terminated SCA adapter) some time, I would appreciate you bringing the link to my attention. I would love to buy some of those, but so far I haven't found any.