So somewhat OT, but I ran across Metal Remnants and thought I’d share
They do cut to order little pieces - and for craft work we’re mostly looking for little pieces so…
I ordered via Amazon, and the re-seller basically added $10 to the order, but they shipped direct with the invoice in there so I found the source 
$21 for a 4"x4"x1/4" chunk of copper (not for the 
) + $9 shipping is WAY better pricing than I’d been finding elsewhere.