Since you live close enough to Phila, you might want to consider
a a local company there and go with a die-struck piece rather
than photoetching. I don’t have the number handy, but a call to
Phila directory assistance for
will get you the number.
As your piece is a disc, I’d think die-striking would be an optimal solution. Simons Bros can
provide you with a gorgeously cut die to duplicate your artwork
and any number of finished or near finished pieces in any metal.
They’ll charge you a single fee for making the die (maybe
somewhere between $150-300 depending on the complexity of the
design) and then for the individual pieces. In sterling, I
couldn’t imagine they’ll cost you more than a couple of bucks
apiece, depending on finish and findings added.
I’ve used these folks over the years to make club and graduation
pins and have had excellent results from them. The designs are
photo-identical and the customer will love the bas-relief effect
of their logo. Just what you need when you need 100 pieces and
have no time to make them.
Good luck keeping 'em happy