One shopper has shared a simple tick to get brand new Nike trainers but at a reduced price.
After the post went viral with 3.5k comments and 7.2k likes, other customers have praised her for the hack.
Posting on popular Facebook group Extreme Couponing and Bargains, JD shopper Sophie explained how she bagged a pair of Nike trainers for just £64.99 - and they weren't on sale.
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As Manchester Evening News reports, she told the group: "This may be common knowledge but just in case - thought I’d share as it could save a lot of people a fortune!!
"I went into JD to find some Nike Air Force 1s. I naturally went straight to the ladies section and tried on a size 6six I couldn’t see the mint ones I was after so I tried the plain white.
"I then showed the shop assistant my phone where I had the Nike website loaded with the mint ones to ask if they had these in stock, but realised the screen I was showing was actually junior. These go all the way up to a size six, the man confirmed that junior sizes are identical to adult sizes all the way up to six, but a fraction of the price because you don’t pay tax on them!
"So the identical white Air Force 1s in the ladies section were £100, two shelves away on the junior shelf - £64.99!! In the end I ordered directly from Nike because I loved the green. Wondering how much money I could have saved over the years if I’d have known adult size six is identical to junior size six."
Thousands of bargain hunters flooded the comments, thanking her for sharing the advice with many say they do the exact same.
Linda said: "I’m a 5 and always buy the junior size, I point blank refuse to buy Ladies unless you can’t get the style in juniors. I bought a pair of Vapor max, £100 junior, £165 Ladies, total rip off!"
Kate said: "Ooh I’m a 6 and spent years jealous of those who could buy from kids for cheaper!! How did i not know this."
Lisa replied: "I've done that before now, I'm usually a size 6, but, depending on where I shop, sometimes I can get a 5 1/2, which is classed as junior, and cheaper."
Jackie wrote: "I always buy kids! My husband got me some ladies air forces in my size and they are so big! It’s like a leg work out wearing them trying to keep them on. My kiddie ones are so much more comfortable!"
But other shoppers warn that the junior sizes can be narrower and some people might have to go up one size.
Hannah who works in a shoe shop pointed out: "I work in a shoe shop, a lot of the time people tend to size down a whole size in airforce because they run big. There is a slight difference between junior and adult and it’s the hight of the back. It’s higher on the adult shoe and lower on the junior shoe."
And another added: "My son works for Nike and it’s a fact that junior sizes are made very slightly smaller and much more narrow than adult\women's. All the same, if they are comfortable then winner winner!"