Take a look at Hamels Fabrics in Chilliwack BC.
http://www.hamelsfabrics.com/ They have a decent selection of wide backings, ranging from about $16-25 a metre. Every first weekend of the month they have a 20% off yardage sale, you can sign up for their email newsletter. I've stopped ordering from the US as well, a magazine subscription I recently renewed the price was converted at 1.37 on my credit card.