Dell Refurbished Store takes 30% off any item via coupon code "DELL30DEAL". Alternatively, coupon code "DELL$$DAYS" cuts $200 off orders of $400 to $599, $300 off orders of $600 to $799, or $400 off orders of $800 or more. Even better, all orders receive free shipping. Some exclusions apply, including clearance items.
With these companies, it might be easier than you think to negotiate your monthly bill down.