Bits n pieces has a flat charge...think is 90.00 for that size. They do an incredible job...I will look for the price sheet. I found it...the price is at the bottom of their page.
http://www.bnpquilts.com/customquilting.html
Twin 65 x 90 $ 85.00 Full Size 84 x 94 $ 90.00
They charge you about the same if you do it or if they do it. It is easier and faster if they do it.