I got lightweight fusible interfacing at Joann's, the last time they had it on sale. I got a 10-yard bold for $1.99. I just used it for the t-shirt quilt I am making for DDIL, and it worked great. I had no trouble at all sewing it alongside quilting cotton.
I haven't quilted it yet, still practicing on scraps before going to work on the real thing. However, I'm using scraps from the actual top and the t-shirt part is presenting no difficulty.