I would suggest going to the Geocaching.com site and follow the link from “Trackables.” They list several coin manufacturers. Some of note are Coins and Pins and Oak Coins.. It really all depends on how many colors, size, and the type of metal you have in mind. They will give you a quote first. Just make sure you are comparing what each company is offering you. Research first.
We are ordering our coin later this year thru CoinsandPins.com They are two Michigan Geocachers (Rusty – the UP reviewer and Trippy. Both real nice people met with them at a event earlier this year and they seem like they are going to be great to work with