Shipping was $26, so I offered him $60 and he snapped it right up. I just finished the deal. They said 60 day return, so it seems no risk to see if it fits. I guess 1/4 of the total cost for shipping it back is risky, but hopefully mastiff and K9 seats are the same. I like my new seat, but I'm still worried about the long term viability of the Butty Buddy for my wife. $80 is pretty good for a base and hardware even if it needs recovering. I hadn't seen any BDM seats for under $250 on eBay before. I'll let y'all know what it looks like when it arrives.