I work for probably the largest graphics company in the US and have the ability to produce decals for call makers, particularly the glass surface pot calls. I already do this for some call makers and thought that it may interest others. The hi-res, photographic decals are printed on a film that is almost impossible to remove once installed and so the glass can actually be attached to the pot by gluing directly to the film if they choose to do so. The standard film is very thin and shouldn't affect sound. Below are some pics of a sample decal that I printed and hand cut, so it is a little rough. The production decals will be digitally cut and will be perfectly round and to exact size.
The Digital Image.
The Printed Decal
Applying the Decal
The Applied Decal
Profile to Show Thickness
Prices are as follows (sizes can be 3.25" to 3.75"):
Quantity of 300 = $1.99/each (Can include up to 10 different designs/sizes)
Quantity of 750 = $1.33/each (Can include up to 15 different designs/sizes)
Quantity of 1000 = $1.22/each (Can include up to 20 different designs/sizes)
Quantity of 2000 = $1.00/each (Can include up to 25 different designs/sizes)
Quantity of 3000 = $0.94/each (Can include up to 30 different designs/sizes)
If you would like to partner with another call maker, that would be fine. If you need prices for sizes smaller or larger than these, please contact me for a quote.