I'm a handyman, not a drywaller, but sometimes I find myself needing to sand an entire bathroom of drywall. It takes a while and makes a gat dang mess, so I want to get an actual drywall sander but the commonly recommended ones by the big brands are all $500+. I'm sure there's a reason they are a pretty penny, but is there something more in the $200 range I could get away with that would do a good job with occasional use (not day-in and day-out)?

Much appreciated!