Does anyone know of a color the same as Tamiya TS-3 Dark Yellow in a spray can? Maybe Krylon or something I can get more of, for a better price? $5-$6 for 3 ounces is a little steep when you have several models to paint. Maybe the same for a German tank grey?

You'll probably be able to find a grey that'll work without too much effort. The dunkelgelb is going to be a different matter. It's not like anyone uses anything close to it now days.