I don’t know anything about return policy at Yodoboshi Camera or anything of that nature, but what I can tell you is that the Fighting Sticks have worse parts than a HRAP. The HORI buttons on the FS2 felt way different (re: chintzy) than on my HRAP3.
HRAP 3 is best bought at Bic Camera. I looked for one EVERYWHERE in Akiba last March for PS2, couldn’t find any but I did look at prices for HRAP3. Bic Camera sells it for 7180 which is VERY reasonable, you might even get a price break on that too because Hori is releasing a SFIV series but I highly doubt it with the way Japan retail is.
This advice will probably suck, but there is one arcade buttons shop/arcade boards shop that I’ve been to. It’s 2nd floor in a building about a block away from the main drag in Akiba. You should be on the street opposite Taito Station (the big one), go down by Yoshinoya, and go down about a block and this place is to the left I think.
Anyway, Akiba is pretty small so if you walk it out for a bit I’m sure you’ll find the place.
Also, maybe you can mod your FS3 OR buy the new Hori SFIV stick? I am not sure if the new Hori SFIV stick will have Sanwa parts 100% but the price point is similar to the SA2 and HRAP 3 SA which DID.