One of the good things about OSTK is they make information readily available:
"What is our return policy?
Most closeout and deep-discount retailers have an "all sales are final" approach to customer returns. At Overstock.com, we offer you the option of returning items that don't meet your needs. Here is our return policy:
You can return most items sold by Overstock.com within 20 days from the ship date.
To qualify, simply initiate the return within 20 days from the ship date and ensure that the item is in its original condition (including: packaging, manuals, warranties, accessories, security seals, etc., and shrink wrap for Book, Music, and Video products). We must receive your item back within 30 days of when we originally shipped it to you. Please allow us 14 days from the time we receive your item to process your return.
Your refund will be the purchase price of the item, less the original shipping fee and less a restocking fee of $4.95 per-item OR 15% (instead of the $4.95 per-item fee) if the item is from our Electronic and Computer category. Customers who paid for their item with PayPal will receive their refund as an Overstock.com in-store credit. "