Build your own for about $30.00
Lap board was one I received a few years ago for Christmas and I repurposed it. It has a nonslip material on the back that I left there and just cut a hole in it. Even has a handle. The cup holder works for holding bits, may put a magnet behind it and that would keep them from rolling out. Pen holder may be nice too.
Switch Lowes $6.00
Dust Bag, Lowes $8.00 in store.
Took me about 30 minutes to cut the hole and assy.
Works real well, fan draws 1250 cfm, bag works well to. It has a strong rubber band and fits nicely over the fan housing.
Real pleased with the results.