Kenneth Cole REACTIONMen's Fit Flatfront Flat Front-Stretch Trousers with Modern Cut Casual Pants

Bought these trousers in a 30W 30L for my teenage son for school. Very hard to get trousers in this size and fitted him perfectly. Not bad quality but not overly thick so I don't expect them to be particularly hardwearing. Paid £8.86 for them which was excellent value (and this wasn't advertised as a sale price). Intended to buy a job lot but having looked 6 days later, they are now a whopping £44.45 per pair!!! They certainly aren't worth this sort of money, by my calculations that's a 401% increase. Can anyone explain or justify this please??