Tower, or their alter ego, Omni, are good choices. Tower's advantage is they've always got some sort of discount going on. Omni offers free shipping on orders over $100, but only occasionally has a discount. If you think you'll be buying often, and over $150 on most orders, Tower's super saver club might be worth joining. The three main values are free shipping on orders over $150, frequent freebies in their coupon book, and first dibs on scratch and dent items.