This seems to be a permanent page as opposed to a timely deal.
https://www.ebay.co.uk/b/Under-10/bn_7001769731

Quite useful for anyone short on money for any reason or just in need of cheap clothes, some good stuff on there both branded & unbranded (can't speak for the womens or kids sections). I've not bothered to check the tech, didn't seem to be much.

In essence this is just browsing eBay with the Max Price filter set to £9.99 but does seem to highlight better products.