These are actually ebay classifieds...

Hairless Guinea Pigs - Skinny | Chicago | eBay Classifieds (Kijiji) | 14533308

and it looks like they're also selling the one that didn't turn out to be a skinny......

Hairless/Dalmatian Gene Carrier - Guinea Pig | Chicago | eBay Classifieds (Kijiji) | 17010070