I'll second the recommendation for Software Hut...I'm a very happy customer!
I've gotten most of my Amiga things from EBAY US. I even found a slightly used flicker magic for my A4000 which I couldn't buy anywhere. I'm also lucky to live very near Antioch, CA, the home of 4Jays Classic Video Games. They have a web site at:
www.4jays.com.
I stopped by to get a nearly new Commodore 64C and 1541-2 and got a tour of the store's storage area. I've never seen so many A3000s in my life. Stacks nearly to the roof of every other Amiga. If you need parts for a classic Amiga I'd check 4Jays. Heck, I even saw a black painted A3000 keyboard which were the from the AAA development systems. Apparently they sold a complete "black" A4000 in a 3000 case a month or so back.
The only thing I'd like more choice of is NEW software....other than that I'm a happy US Amiga user. As for the $$ vs pound discussion, I was stationed in England in 1969. The rate was 1 pound = $2.40. I was thinking the exchange rate looked good! Guess it's all in your perspective...
Bob