Have you considered maybe using the Inhaos Buono Mega 2560 (see [a][1]), also called the [Inhaos Mega2560][2]?

As far as I can tell, it is pretty much identical hardware as the Arduino Mega 2560 -- including the ATmega2560 processor -- except it has a selector to run the ATmega2560 at 3.3 V, so its I/O pins can be directly connected to 3.3 V modules.

Like many websites, every page on the Inhaos website http://www.inhaos.com/ has a "Contact Us" link at the top of each page. Click that link to get a list of several ways to contact the company.

  [1]: http://www.inhaos.com/newsview.php?news_id=44
  [2]: http://www.inhaos.com/product_info.php?products_id=117