What do you want it for ?
For .22 shooting on range or spotlighting possums or day shooting rabbits, you don't need much ruggedness nor resolution but you do need close focus, so a cheap scope can work pretty well. I use a Leapers 3-12x44 on my air rifle and its just fine. It's rated for air rifle recoil. I don't dial it though. And I wouldn't take it out for deer. So, it can be done ultrabudget for some applications.
For deer hunting in NZ mountains you do need reliability and waterproofness but not dialling and not parallax. If your budget extends to $400 then I'd recommend an entry level Leupold or a Redfield. I wouldn't use those on a springer air rifle.
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