Congrats on getting the starter out. Try taking it apart and cleaning it up. Be careful with the brushes, those wires can get broken easily. Clean the bushings in either end and lube them with just a touch of moly grease like car suspensions use. Brushes shouldn't be more than $10 and are simple to replace. This might do it unless the commutator is obviously not smooth. If that's the case, call around to several auto electric shops for estimates to repair it. It'll probably cost at least $40 but shouldn't be more than $75-$80 max.