Thats a very pretty dress and cheers for posting a link to the pattern. If you live in any kind of visiting distance of Glasgow Id go to Mandors, I hail from Kent but when I was up there I was very impressed by their selection and prices, where I am we only have C+H fabrics who are helpful but expensive! Otherwise I tend to get my fabric from Ebay theres generally a good supply of exciting and varied fabrics if you can be bothered to sift through the fat quarters! Alternately you could try this site http://www.efabrics.co.uk/
I think their prices are pretty good, but I haven't had a chance to order anything from them yet.
hope this is of some use and I sympathise completely with not having a good fabric shop nearby, it drives me crazy!