Wanted Cheap Shimano 10 speed 172.5 and 170 cranks

Hey everyone,
Im just getting back into riding after a 4 year hiatus and I’m trying to get my knee issues sorted out. I’m looking at trying out a pair of 172.5 and 170 cranks to lessen my knee angle. Since I dont know what will work for me yet I’m looking at trying out a few cheap ass cranks before buying a decent set. I’m looking for a set of 10 speed… 105 or tiagra cranks to experiment with. Let me know what you have!
Thanks
Eric