Secret Sales has slashed prices on thousands of clothes, health and beauty sets and watches.
The website is selling a River Island men’s suit jacket for £7 instead of £95 – a 93% discount.
Meanwhile, shoppers can pick up a GV2 women’s quartz watch for £219 instead of £2,995 – that’s 93% off.
Fashionistas can buy an ASOS Design green grandad blazer for £6.20 instead of £62 too – a 92% discount.
Deal-finding site Latest Deals posted about the Boxing Day sale on its website, with some eagle-eyed shoppers keen to snap up a bargain.
Read more in Boxing Day Sales
One said: “Some beautiful items there,” while a second commented: “Corker of a deal.”
A third added: “Love secret sales so this is a great offer for me thank you happy Xmas.”
Fans looking to pick up anything from Secret Sales can get free UK delivery on orders over £50.
Any orders less than £50 will be charged £1.99.
Most items are delivered between three to five working days while others may arrive between one to three.
You can return any items within 60 days of purchase for £3.50. Any returns must be in their original condition, with labels attached.
It comes as a three major retailers slash prices on thousands of products in the Boxing Day sales.
Major fashion chain Next has dropped prices by a minimum 50%, including on women’s and menswear, homeware and branded items.
Shoppers can snap up the bargains from now online while the sale is hitting stores from tomorrow 6am.
Matalan has slashed prices on thousands of products online, in-store and via its app too.
Customers can get discounts on menswear, womenswear, kids and furniture.
And Dunelm is offering up to 50% off storage items, from shelving units to baskets.
In other news, we spoke to one retail expert on the best Boxing Day deals to keep an eye out for to get up to 70% off.
Plus, the full list of shops NOT taking part in the annual mega event this year.
Online marketplace Secret Sales was created in 2007, now offering flash sales on thousands of designer items such as Gucci, Ted Baker and Emporio Armani.
It has a 3.9 out of 5 star rating on Trustpilot, which collates customer reviews of businesses, with over 70% offering a five star rating.
You can also join our new Sun Money Facebook group to share stories and tips and engage with the consumer team and other group members.