I've got a pile of this stuff. Use by date is March 2014 so it's out of date but it's been stored sensibly and is going to be good for a few more months.
http://uk.farnell.com/kelan/141304/pcb-photo-resist-s-s-440x305mm/dp/699421?Ntt=699421List price £28+VAT, anybody interested in sheets at £10 including VAT and shipping UK only?
I can ship elsewhere as well but you really need to be buying more than one sheet to make it worthwhile shipping it. Ask me for a quote if you're interested. I can probably cut them in half to make shipping easier.