Sorry to read about this situation.
A few things, however
You say :Well, you have not been looking hard enough. YSL Rive Gauche pour homme is found in every small fragrance shop or kiosk I have been to. As well, Sears was getting rid of the 125ml bottles last year for $25. Maybe you missed out. But nevertheless, you can easily find this fragrance.I live in Canada, and to my knowledge, it's practically impossible to find YSL Rive Gauche pour homme anywhere (online or in stores).
Also, YSL Rive Gauche pour homme is online at Enchante Perfumes. Check them out. They are out of Toronto.
Good luck. Let us know how things worked out.