I don't have a link. However, I'd like to share my limited experience. I brought a cross stitch to Joann's a years ago armed with their coupon for framing. Even with the coupon it seemed an outrageous price. I'm tempted to say a couple hundred dollars.
My step sister frames all of her own work. She told me what to use to mount it on. I'm not as crafty as she is and I don't have all the tools necessary to cut my own frames. So I decided to do what I could. I used a coupon to purchase some sort of hard sticky white board, stretched my art work out on it, then brought it back to be framed. The white sticky board did not cost very much at all.
Armed with a frame coupon, I brought my mounted cross stitch back and got a quote for under $100. I really still don't understand how my mounting my own work (something that cost ~$20 at most) could bring down the price so much. However, it's done and looks wonderful! Good luck!