Whenever you're buying discount items or bargain shopping online, make sure the site you are using has an excellent return policy. You want the return policy to be simple and straightforward and all encompassing. Buying something sight unseen and without the possibility of refund is just not smart.
The return policy is especially important if you're buying refurbished, reconditioned or open box items. Protect yourself and your money - that is the best bargain finder rule of all.