I'm familiar with VRBO, but most of those listings are for nightly or weekly rentals... there are some monthlies but not many.

In any case, finding listings isn't the tough part; finding affordable ones and/or people with whom to share the rental, is. I'm hoping there are some avid Tahoe-fans here who want to join us... Or perhaps locals who have a studio in their backyard that they're willing to rent to fellow FTers for a good price.