Personally, I bought mine from G.I. Jewelry. It's about 12 dollars (not counting shipping). Nothing fancy about it, no frills or extra decorations.
This very tough Pentacle is precision carved out of non-magnetic, non reactive, brite finished, 100% 304 stainless steel. It has a 24" stainless steel dog tag chain and is 1" tall x 1" wide x 3/32" thick.So yeah, it's slightly larger than a quarter if that gives you a good reference.
However, pewter does get the job done and may be worth the investment as a pentacle. Your choice really.
I got mine from a lovely little shop in Glastonbury nearly 15 years ago and still looks brand new! (It's been worn every day since, and still going strong!) ;-)
Not much help if you aren't from England, I grant you, but useful if you come here on holiday I suppose lol
they sell them here at this site actually. And the money goes to support witch school and the world of witches museum.
amazon or 13moons.com
Which one? I got one online through azuregreen.com and another was given to me by an Alexandrian Priest.