Just now I followed a link to a newly marketed bench strop. It's a block of wood with a couple of socket head screws to take bits of MDF with leather on. Or not. Depending. Some number of dollars are asked for it. I genuinely thought it was an elaborate joke. I looked at the other products and there's a surface plate "cover kit" (soft fleece, no less - cosy) and a piece of ply with, um, a hole at one corner to facilitate shaping things. Apparently it's not a joke.