[Invalid or Expired Link Removed] Personally, I'd call the number listed for the GC Florence store there and ask them if this cab is 4 or 8 ohm.
I'm just throwing this out there, because it could end up being an awesome deal. Biggest risk is having to pay for shipping if you don't keep it, but you'll be able to return it at a local guitar center if you don't like it or have any issues with it.
I snagged my used Avatar b410 @4 ohm for about the same price if not a little cheaper some years back and haven't felt a need to go cab shopping since.. I'm not saying it's the best cab in the world, I haven't really had opportunities to compare it next to anything else. But for $250? If the thing is functional, I'd say it could be difficult to find yourself unhappy with it. I think mine sounds great. But I also lucked out, the speakers, including the horn all work like they're supposed to. Only thing "wrong" with mine was the avatar logo was ripped off, and that didn't bother me.
I've never been in a situation where I need max volume from my 500w MoMark head. My current drummer, I maybe turn my volume to 9-10 o'clock to play with, but he's pretty quiet compared to the hard hitters that seem more common where I maybe end up between 1-3 o'clock. Standing about 3-5' in front of it when it's flat on the floor will give your ears a good example of the speakers range.
It is not the lightest cabinet in the world..but not the heaviest either. And the one I linked you seems to have casters installed.
*editing in more food for thought* - these things or their equivalent list @ $519 new at the avatar website, and the Deltalite II's are on sale for $539. Just kind of a personal experience thing, not a lot to choose from locally to try out in a music shop. My first set of cabinets were Markbass, new, and costly. The b410 is my second cabinet.. and gambling on a used cabinet for $250 afaic worked out in my favor, but I wouldn't blame anybody if they had their eye on some brand new Mesa Boogie cabs or something.