Where can I find a Benz lps cartridge for sale?

I don't think it is 'demand' that has prevented Benz from supplying the US market but more likely supply! They are able to sell everything they can produce. No need for a US market!

I have been told that Mr. Benz is getting up in years, and
since he is personally involved with the production and/or
testing of each cartridge there are some limitations on their
worldwide production.

Just a suggestion ... Lyra makes a very special cartridge. I own the Kleos. Very, very nice. Listing to Sarah Vaughn. What a voice.

I went with the Ortofon Cadenza Bronze, which is a superb tracker and is stunningly silent in the groove minimizing any surface noise. Also just a touch of warmth and sweetness compared to some other Ortofon models. Highly recommended and a superb value as well!

Ernst Benz, founder and chief designer of Benz Micro was in poor health over the last couple of years and passed away earlier this month (July 2014) at the age of 82.