Many of us have a box of old gadgets, random cables, and used batteries gathering dust in the attic.
While clearing this out might sound like a chore, it could land with you with a tidy profit.
Experts from Protect Your Bubble have scoured eBay listings to find the most valuable retro gaming consoles.
Topping the list is the NTSC Limited Holiday Edition Xbox Original, which was just £299 when it was first released in 2001.
If you were clever enough to hold on to yours for the last 25 years, it could now be 1,601 per cent more valuable - reaching £5,086 on eBay.
According to James Brown, director at Protect Your Bubble, vintage games consoles are shooting up in price thanks to a wave of nostalgia.
'Retro gaming isn't just having a moment. For many people across the UK, it starts as a nostalgic trip back to childhood, but the resale figures show these consoles can be worth a healthy sum, with many collectors on the lookout.
'If you've got an old console tucked away, now might be the time to check what it's really worth, especially if it's just gathering dust in the loft.'
Experts have revealed the vintage gaming consoles which could be worth a fortune, with the original Xbox selling for up to £5,086 on eBay.
Although retro game consoles are now more collectable than ever, it is the rare and limited edition versions which can fetch the highest price.
Following closely behind the Xbox Original is the Nintendo DS, the wildly popular touch-screen handheld that was launched in 2004.
Originally retailing for just £99.99, one of these highly sought-after devices recently sold on eBay for a staggering £1,816.
Likewise, rare editions regularly fetch several hundred pounds at auction, with one Zelda Phantom Hourglass DS Lite selling for £991.
Sony's PlayStation 1, meanwhile, came to Europe in 1995 and originally cost £299.
While the average top-end resale price in 2025 was around £217, the rare Net Yaroze Black and Matt Black editions go for significantly more, with one reaching £1,744.
The successor to the PlayStation 1, the extremely popular PlayStation 2, is also worth a pretty penny.
Released in 2000 with an RRP of £299, one of these now-rare consoles sold for £1,653.
Rounding out the top five most valuable consoles is the Nintendo Game Boy, which went for a staggering price of £1,562.
If you do happen to have any of these rare editions, holding onto your old consoles might have been a great financial move.
Protect Your Bubble found that several retro consoles actually grew in value faster than inflation.
The strongest financial performer was the Nintendo DS, which can now sell for 904 per cent more than its inflation-adjusted cost.
Likewise, the most valuable Xbox models can now be worth up to 795 per cent more than their 2025 inflation-adjusted cost of £568.
The Nintendo Game Boy also posted impressive gains since, although its inflation-adjusted value would sit at £188 in 2025, one unit sold for £1,562 - a 733 per cent increase.
The Nintendo Game Boy also proved to be the most popular retro console, grossing a whopping £302,417 in 2025.
More than 5,300 of these iconic consoles were sold last year amid a surge in popularity for games like Tetris and Pokémon.
This comes as Pokémon, one of Nintendo's most enduring brands, celebrates its 30th anniversary.
As fans celebrate this milestone, experts have revealed that Pokémon cards could be worth even more than the consoles.
Last month, YouTube superstar Logan Paul sold a single 'Pikachu Illustrator' card for a record-breaking $16.492 million (£12.244 million).
But it isn't just the most unique cards that can be worth a fortune, as a legion of avid collectors has sent prices for relatively common cards soaring.
According to the Card Ladder Index, which tracks the value of Pokémon cards, a selection of popular cards is now worth 6,208 per cent more than they were in May 2004.
In January this year alone, fans spent $450 million (£333.95 million) on cards.
For example, if you were lucky enough to pick up a 'Gengar & Mimikyu GX' back in 2019, that card would now be worth $1,323.56 (£982.24) - more than double what it was worth last year.