JMatter is priced very aggressively.
We charge no royalties for deployments. JMatter does not use a deployment-based pricing model
The price is $500 (US) per developer per year.
Read the article Data on JMatter for a very real sense of the business value JMatter offers.
Although we use paypal for payments, the paypal service accepts major credit cards (i.e. a paypal account is not required).