I use this thread for my nicer machine quilting quilts. It's worth every penny.
It's like quilting with butter and a hot needle! and makes my so so quilting look fantastic.
Diane Gaudynski YLI 100% Silk Thread Cone Set
I clip grocery coupons until I save enough to buy a set. That's the only reason I clip coupons. I feel like it's free!
You can find appliqué silk thread sets at Connecting Threads too.