Stamps I have no idea about where to buy as I make my own from fimo or wood dowel. As far as large cabochons go with unusual shapes and stones, one place I like is http://www.designercabochons.co.uk/index.htm but there are many others if you hunt on the web, Etsy is also a good place to find designer cabs, most of the sellers are in the US but I have found to date they are reliable and of good quality.
edited to add : though obviously my stamps would not mark metal but are used for PMC :0)
edited again lol: a quick check for decorative stamps UK brought up these http://www.the-beadshop.co.uk/beads-...p-punches-c220 not sure how big they are but it is certainly a start.
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