do you have the model number of the 12" driver and the particular model of the ESS Monitor you have?
For comparison, Orange County Speaker here in SoCal sells the foams for $30/pr and that's on the high side of many suppliers. And yes, they have specific foams for specific ESS woofers. They would charge $45 to do the refoaming, foam included, but you would have to ship them.
This is what some of their ESS 12" driver repairs look like:
AMT1
ESS 680-2058 680-1058 12"
ESS 680-0023 11 175 12"
heck no, the AK community needs to know who does good work and who does bad work, and equally, does bad work and overcharges too.