Well, you don't need to buy a brush. Certainly there is some old scrub brush in the kitchen somewhere, or maybe an old shoeshine brush (do wash out the old polish).You only need a 5€ brush, 2€ cream, 10€ razor, and 0.05€ blade to get bbs shave in 2 passes
Rest is just a waste of money...
Anyone who gets BBS with 2 passes has a considerably less manly beard than myself.
Of course that's just nonsense, but I thought that was where you were going.