I've been using these modules for some time in various projects and have made my own interface boards. None were to my liking so I went back to eBay for another look. Found these recently and ordered five for my latest project. The board has a 3V3 regulator and appropriate filtering. The only thing lacking is mounting holes at the board corners but that can be easily overcome. Two of these are now in use with no problems. You can get them here.