Kona Solids come in various shades of white but I've not seen a great deal of solids here. Fabric Vision does have a range of cotton solids, I think they call then "homespun" and while the quality isn't quite as good as Kona it's still pretty good and I'm using it in our quilt. I do wish there were more solids available here, I really like them to set off a block and for my next quilt it'll be mainly solids that I ordered from the US.
I've seen them at www.fabricshack.com
which does half price international postage; and I have a Kona colourcard here if you want to take a look sometime.