No need to go to the States for the little bottles: you can get the 60ml Bausch & Lomb Renu solution in Boots (I forget how much it costs over here: probably nothing like as cheap as 99¢).
What really irritates me is that the other major brands (Boots own brand included) sell "Travel packs" of their solutions but all of them are over 100ml. You'd have thought that by now they'd have got their act together. Many Boots stores now even have a travel shelf where they sell shampoo, deodorant, etc. in sub-100ml bottles - so why not contact lens solution?