Erm there's a site I maybe shouldn't share because it's better the less people know...anyway, it's a police disposal auction site... Some cracking bargains if you look for them!
I have in the past, bought some supplements off there, Got them for about £10 each for 3, Sold them on eBay for £30 each Granted the police station was in Rotherham and I'm in Barnsley so I had a bit of a ride out too