I am always picking up gadgets at Joanns with 40 or 50 percent off coupons.
Eleanor burns flying geese rulers are a must have.
Bent safety pins with plastic covers for pining before quilting.
Quilt clips for the edge of the table to stretch the backing before the batting and top are added.
But I have found that a sewing table for flat surface quilting is the best thing yet.
I have so many pattern books and mags but I always end up using El Burns patterns. They turn out so well, never have a problem with her patterns.
I have half a dozen different scissors but only use my small ones for clipping threads etc. The big ones get so little use that I wont spent the money for good ones.
Got several different feet for my machine that are must haves. 1/4 in and the stitch in the ditch and the walking foot.