Yup, I'm pretty sure they have the same tracks, as evidenced by this picture compared to the the track listing for the "Jap/Aus" version.
I haven't actually used GEMM or Music Stack, but it seems that they're both just places where individual sellers can list their items for sale. As such, I'd go with whoever has the highest ratings.
The CDs I linked to were supposedly the Jap./Aus. version, but if you're okay with the Japanese version, here's another option I spotted:
http://www.musicstack.com/item/15380842 … er+side+of
His rating is very high, and he claims to have one copy available. If $38.73 is still too pricey, I'd definitely recommend going the Yahoo Auctions Japan route, using Shopping Mall Japan or a similar service (Celga and Crescent Shop have similar fees). If you win the 500 yen auction I linked to before, then add the commission fees and shipping, the total price would probably be around $20, if not lower.