Sanding Tools?

I imagine this has probably been asked at some point, but is there a tool that's good for sanding 3D prints? I have a belt sander, but I imagine that'd just melt the PLA. Also, it's probably not the best for anything that's not a flat surface. I'd do it by hand, but I unfortunately don't have a lot of time or patience to spend. Does anyone have a recommendation of a (hopefully reasonably priced) sanding tool that works well with PLA prints? I understand doing smaller detailed things by hand is the best option, but how about objects with larger areas to cover? I've been told about lowering layer height, but I use my library's 3D printer and they have limits on how much time they're willing to spend on a print. If anyone has any insight, I welcome it. Thanks!