Sending something back to Best Buy is nice and simple but check the Returns Policy before you send the goods back as it can be subject to change.
How to return an item to Best Buy
You can return your item in Store even if you have purchased it online. Take the receipt or packing slip along with you as well as the credit card you used to purchase the goods plus some photo ID.
Another popular method is to Return By Mail using a courier service. You can access discounted courier rates using the Parcel Monkey shipping calculator. Just put the returns form from the packing slip inside the box when you return it to attach the returns label with the Best Buy returns address on and ship it via your preferred courier service. Best Buy advises using a tracked courier service.
There is also the option of using the Best Buy pre-paid postage label, which will simply need to be attached to the box before you drop off at an authorized UPS drop off location. The return shipping fee will be deducted from your refund.