Outdoorsy.com is another share site.
Based on my experience, I *highly* recommend trying to meet up with the owner prior to committing to renting the unit. The pop-up I rented from Outdoorsy looked great in the photos. In reality, it was pretty beat up and completely filthy. I spent two hours after I picked it up just to get it to the point I felt comfortable putting my stuff in it... this included about 15 minutes of thoroughly sanitizing the little bathroom area when I discovered a significant amount of dried up, caked up urine. I did not budget two hours that night to clean up someone else's mess, so that completely threw off my departure schedule the next day.
Then, during the monsoon with gale force winds on Friday night, I discovered that the seams on the tent portion of the pop-up were not well-sealed any more, and that the actual canvas waterproofing was also failing.
Needless to say, I was thoroughly not amused. Wish I had inspected the unit before I committed to it, because I would have happily paid $10 more per day for a better unit.
Renter beware.