appears to be a series 1 low power Xbee that would work as a receiver. A PRO module is better, but quite a bit more $. I looked up the "XB24-AWI-001" number and it is the number on the Series 1 tranceiver listed at Mouser for the S1 (and Mouser uses that as the part number on their site).
It is $12.35 + $2.45 shipping = $14.80 out of Oklahoma.
I am no way associated with the seller other than I just ordered one.
(edit) The markings on the picture on the Ebay posting indicate these were manufactured BEFORE the company sold to a new owner over 2 years ago. In theory, this should not matter, but there is a chance these may be obsolete per Dirknerkle (see later posts).