I've had a Bernina many years. Always used Mettler silk finish until a little over a year ago and am now hooked on Aurifil. Last month, I saw a thread for Tristian Italian Threads. They were offering boxes of 24 spools for $56 (I think). I ordered two of the assortments - a lot of $ spent on thread, but I'll have it for a good while. Just got an e-mail from them; they are having another "door crasher" sale for Aurifil. Check www.tristan.bc.ca
They are in Canada, but it was still a great savings for me and I had my package in 10 days or so.