Cheap and good are mutually exclusive terms.
Good is never cheap
Cheap is never good.
or as dad used to say in a bad Scottish accent
"He who buys cheap pays thrice"
Over the years his wisdom has proven itself to be 100%.
If you only have $ 100 then spend it on a used mower from a mower shop.
A real mower shop with repair men, and boxes of parts and people with a reputation to preserve.