I've just been into Tesco and they are selling several of their own brand photo paper at 2 for £10. The 6x4 packs are around £6-£7 each and the normal A4 is about £7 but the finest 260gsm glossy is normally £10.97 instore so it's better than BOGOF!
I've checked the website but there's only one of the smaller packs listed under this offer, the finest A4 is £7.35 for one pack of 50 online.
10p a sheet for photo paper this thick seemed a pretty good buy.
(Price is for two packs)
Sorry I still can't fathom out how to add a picture!