Prices for Quilt fabric are lower in the US. Since you will be so close it may be worth it to go across to the US.
I think you would like the Quilt Farm . When ever I am in the area it is a treat to go there.
Do note ... if you do decide to go .. do not think you are lost ...as you will be out in farm country , the shop is in a Barn. It takes up the entire barn. Excellent selections, very good pricing. Make sure you go upstairs , there is more to explore .
http://www.quiltfarm.net/