bboy, without pushing retailers too much the ol' sunglasses hut has a good range from the cheap to "Oh Jesus are those gold plated?" range of sunglasses wear. The range I find is quite good over most brands and for purely for trying them out and I have usually run into reasonable staff who are not afraid of discounting their product a bit or throwing some sunnies care gear in with your purchase.
I too had the same problem with arms making noise leakage annoying but just as a note thin arms may fix this problem but cause others and it all depends on what headsets and seals you have. Eg DC's with the gel ear seals. My Serengeties have sprung arms and are quite compatible with my gel seals. Albeit a little more noise does get in but no more eye strain, and no more headaches from the arms biting into the sides of my head.
Anyway its fun shopping for them and an excuse to head to to the Music/DVD shop next door!
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But Mum.........