Turkistan Roach Catching

This is probably an extremely dumb question but I need some advice on how to catch Turkistan roaches to dust with multivitamin to feed my veiled chameleon. I have one of those cricket feeder rocks that I can put the multivitamin in and dust them with. I also have a plastic cricket counter but I cant seem to scoop them up fast enough and they also get away as soon as I dump them into the feeder rock. I am too slow or they are just too fast for me lol. Any suggestions?

My friend would stick his feeders in the freezer for a tiny bit to slow them down, But the problem would still be how do you get them into a container to stick them into the freezer:P

The feeder rocks are a waste of money if you ask me, just dust and dump.

dump them in a bowl, throw some powder in the bowl and shake. You can slow them down by putting them in the freezer.

I use a drink mixer( from a bar thing james bond) I love it as I can catch just about anything as the opening is large and the top pops on quick. I absolutley fell in love with it for fast fruitflies.