A study reveals that £2.4bn was spent on unwanted Christmas gifts, with Lady Gaga's album Born This Way topping the list.
The survey by eBay and Gumtree found the average value of undesirable gifts was £48.41 with clothes, beauty products and handmade items the ones most likely to be given away, returned to shops or sold off on auction websites.
The least desirable DVD was the Inbetweeners Movie, with 44,758 copies available on the musicMagpie website.
The site made offers on more than 2,686,540 unwanted presents on Christmas Day and Boxing Day this year, a 14% increase on last year. Over 32,705 people sold an item to musicMagpie before 11am on Christmas Day, with a peak in visitors at 3pm on Boxing Day.
Around 189,574 dresses were sold, as well as 36,256 men's Topman T-shirts.
Liam Howley, marketing manager for musicMagpie, said: "2013 has been a record breaking year for us and we expect this to continue in 2014.
"The period between Christmas and New Year is always one of our busiest times of year, as people don't want to hang on to presents they have no use for and look for ways to make money to help with January finances.
"We know some people put unwanted gifts aside to re-use next Christmas, but a lot of savvy customers take advantage of the unwanted items in the home which they don't use. We're here to help them de-clutter and make cash."
Perhaps surprisingly, listings on Christmas Day for computers and tablets increased by 25% on eBay in the UK.
Gumtree reported iPhone and Playstation (both PS3 and PS4) as top search terms over the past few days, with nearly half of searches relating to unwanted gifts, while brand-new, unwanted iPad Air listings outnumber iPad Mini by four to one.
The report by eBay and Gumtree found that eight out of 10 people in the UK would be keen to sell an unwanted gift.
Watch Lady Gaga's video Born This Way, below: