Are there taxes from items purchased in the UK?

The declared value is usually low so you don't pay much if anything. I was doing this 44 years ago and have lost track how many things I have brought in. That said, unless it is a very exotic item you might be better off looking for one on Audiogon.

Considering the economic times I would try to negotiate a lower price here, at that price level there should be a considerable profit margin. If they are being shipped to another state you shouldn't pay sales tax. I have had all kinds of experiences in the past, including a US customs agent telling me he wasn't going to let my speakers off the ship until I gave him $5. I was there and I don't believe it either. I never had a broker but that was years ago, I brought some electronics in by air in the early 90s and picked them up at the airport myself, but 9-11 hadn't happened then.