I just finished two t-shirt quilts. One is double bed sized and the other is queen sized. The professional long-arm work cost more than $250 total for both. The sashing, borders, backing for both, and non-woven fusible backing for t-shirts (with much cut off, therefore, wasted) required lots more $$. T-shirt quilts are more expensive than a customer may realize, so I recommend a contract like Jan's too. Good luck to you! Get it in writing with a signature and at least 1/2 the total estimate.