Brison is still around and Distributed by Kangke. There are some used BME engines that would also work. As I recall they are 78 or 80 cc. BME was sold about a year ago. I spoke with the new owner after shipping engines in for service. They plan to be doing some new items soon. 3W has the 48B2 listed as no longer in production. Check with Gerhard @ Aircraft International http://www.aircraftinternational.com/ as he will sometimes have items not shown. Good luck. Bill