The thing with Ubid is you have to look at the shipping charges before you bid. Sometimes the deal isn't so hot after shipping is tacked on. I've gotten about 7 pairs of speakers from Ubid by various mfgrs that were still a good deal with the shipping, though.
I remember bidding on some refurbished Infinity powered towers about 4 years ago and winning the item, then having Ubid tell me they ran out of them. They gave me the option to just forget the whole thing had happened or accept a new pair of Bohlender Graebener Radia X3 floor standers at my winning bid price, which was $109 for each speaker, in place of the Infinities. I snatched the BG's up and still have them, but not using them currently.
I consider myself lucky on that one since Harman International had a bad run of sub amps for awhile that were crappin' out in Infinity and JBL towers and subs, which is probably why the Infinities were refurbished in the first place.
It looks like Ubid is now auctioning/selling "white van" speakers now.

- the kind that can be found on Ebay.