The only place I know that has parts for the Begin Air is Parkflyers.com. I second the "tape everything" comment. I use 3M reinforced packing tape, put it along the LE and the sides of the wings I have landed poorly a couple of times, and I fly over desert terrain so the plants and ground are pretty sharp and unforgiving. It's no fun picking cactus out of a foam wing, nor having a chunk of foam taken out by a rogue rock or two. And while the tape doesn't entirely fix / protect against either of these, it does help a bit from the foam getting too chewed up.

And for the record, I have my report about half typed, and am working on some video of the plane in flight too. I will get it all posted sometime tonight.