They come with the standard S2+ brass pill.
Simon recently made a copper S2+ pill available for sale, it is not included with the copper S2+’s
The “Big Ret” copper pills were made by a forum member, Hoop, but they weren’t easy to make and he’s said he’s not making any more. I believe he may have some triple pills left but none of the single pills.
Kiriba-ru also makes copper pills available, both for triples and singles, and as far as I know, he’s currently the best source of copper pills for S2+’s