Hopshopgo is the solution to that, got my frees from eastbay for about $50 a pair cheaper than here, with a wider range of colors to choose from. Works best if you get multiple pairs though, I got 2 frees and my mate got a pair of asics.. Postage worked out to around $110 all up, which we split. Was about $10 postage from eastbay to the American address hopshop provide, $100 from them to aus.
As for sizing, I try em on in stores here then order online