BME closed a good while back. They used mostly Echo parts on/in their engines, but prepare yourself. The prices of Echo parts to the public are nuts!!
What do you need? Bearings and seals are best bought from Boca Bearings. Then there are aftermarket piston ring suppliers. Ignitions are best, and cheaply served with CH Ignition, RCEXL, or RCAP parts. I have a few used parts for pistons, cylinders and cranks. (Very few.)
AV8TOR