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Do a search and in the left column go down to "Show Only" and select "Sold listings", or "Completed" if you want to see what didn't sell too..
You don't need to type in completed in the search box
Show only
Expedited shipping
Returns accepted
Free shipping
Completed listings
Sold listings
Free In-store pickup
FWIW, the JBLs seem to be more expensive outright than the SX-1050. $600 is about what a mint one would bring with shipping, but before eBay fees. The seller seems optimistic in his pricing.