Discount tires has awesome forum discounts and also Jeepaddons. Chris at Jeepaddons was very helpful last year when I was getting my Trektop. Great customer service.
Most all the vendors on the forum will do price matching and most will offer free shipping if you PM them
Discount tires gave a $50 forum discount and a $50 discount if you bought 4 tires plus $30 if you use their credit and also offers free shipping
Jeepaddons will usually give a discount to forum members if you ask. The amount depends on the product.