I know you said you did not want to build one, there are a lot to choose from, this is just one example, looks to have everything but lighting for just over 100 bucks, to add the lighing, you can get 2 folding lamps and use the clamps that come with them to attach to the top shelf, not sure that counts as building, this does have outlets and looks like it would hold a vice.http://www.amazon.com/TENNSCO-Workbench ... s_indust_1
Alternatively, a short visit to Home Depot and well under 100 bucks plus a few hours work will get you a very good workbench, personally I never liked metal benches, so I went with 3/4" ply (about $18) - cut, a can of spray on glue for flooring ($2), 10'x2' pieces of soft plastic flooring cut to length from a roll ($8), few 2x4's, some plastic edge molding (cleans up the edges) and a few plug stripes on the back lower table on a 2x4 backstop. Plug strips were the most expensive parts, I do have two lamps I can clamp to the top shelf when I need more light and there is a small flor light you can't see under the top shelf, as well as additional plug strips mounted under the main bench area. It is 5' wide by 4 feet deep, and you can make it what ever height suits you, I stash more parts and tool bin under on the left and right. I put up shop lights in the ceiling and as you can see that is a no flash picture with just one bank of lights on. Seems you can never have too much light.
Excuse the mess I am in mid-project on something not going as well as I would like at the moment... As you can see you can get a lot on it and at 3/4" ply and 2x4 support you can make it any size that suits you.
Good luck which ever way you go.