steel toe shoes for 300lb guy on my feet all day?

or an insole recommendation for my sketchers composite toe sneakers that I'm already using. love them to death but my heels and knees are killing me.

the cheaper the better. "poor man's boots fallacy" I know, I'll get the $300 stuff if I don't quit my job from the pain before the checks come in. i get paid once a month. warehouse.