While as Ray pointed out, the 1 x 42 isn't the ideal grinder, you mention cheap belts on Amazon. No need to further handicap yourself. If you want to use it for a while, at least get some good belts.
Two good places here:
https://trugrit.com/index.php?main_p...dc8b719747600d
https://www.combatabrasives.com/stor...g-belt-1-x-42/