At the 2000 convention, we were told that mintage figures are a trade secret and that it is up to the casino to release figures if they want to. Some figures seem to be known, such as the final pair from the Riverboat and the Bridge and Trolley from Golden Gate.
However, there is no limit on production unless the strike itself contains a "Limited to..." such as the recent Reno Hilton set or the chase strikes like the Plaza twofer.
As an aside, please include your email address in your post. We have had some "shill" posters on this and other boards, so we like to know who you are.