Wanted: Paving slabs, Surrey

Managed to source an aviary for my foster ferrets but when I've gone to put slabs down, I've found out that the stash my mum left at my house has slowly been pinched by relatives in need and there's only a couple left, doh! I need maybe between 10-20 slabs, to cover a 6' x 5' area. Preferably free, or at least very cheap, as the aviary was a bit over budget! Can collect, not too fussed about colour/texture/quality but would prefer whole ones. Thanks