OK it's not much help as you can't just go and buy one but I my £15 Lidl cordless is good enough for using at work every day, mainly for sucking up small amounts of sawdust and wood shavings and chips. A corded one would be OK too, and would last longer (no battery to wear out), but I bought what they had.
I even bought a second one for home use, where cordless is actually more useful.