Here in the UK our prices are horrendous so as a Senior Citizen on a budget I shop canny and get 99% of all my quilting fabric and threads from the USA as even with postage it comes out to up to 30 - 50% cheaper than what we can get here.
For the past 5 years I have got ALL my threads from here:
http://www.threadart.com/c-660-all-cotton-thread.aspx the quality and selection, besides the service is A1+++ These cones
http://www.threadart.com/c-6-heavy-d...on-thread.aspx are exceptional and I know a number of long arm quilters who have been delighted and amazed by the quality, price AND lack of lint.