I replaced about the same amount - it is important to figure out what type of doorknob it is and then see if it works to order off amazon. sometimes there ar e6 packs. Home depot had some bulk packs too. But there were a few linen closet doors (ie. no knob on the inside), a few bathroom/locking doors, a few that didn't lock such that I wasn't able to use any bulk deals, even though I tried.

Because I have 20 or more doors to be replaced and would like to save some money - can't find them in bulk so I'm asking if anyone has

Why are you concerned about buying in bulk OP? If that gets you a better price go for it?

I'm looking to replace all of my house's interior door knobs. Anyone had luck buying in bulk? I'm surprised in the lack of selection or good prices I'm finding online so far...

I don't care what is trendy, plan to be in this house for another 20-30 years and looking for oil rubbed bronze.