TexasCHLforum.com

Couple of comments:
1. Casitas are not cheap. Plan on $20k new or $8k-$10k for an older model in decent shape. If you plan on more than 2 people camping forget the Casita. I've visited the manufacturing facility and showroom. Their biggest model wouldn't come close to accommodating my family of four.
2. Used travel trailers can be bought cheaply but are heavy and bulky. Wind resistance is also an issue when using a light tow vehicle.
3. Pop-ups don't have the weight and wind issues but set up takes longer and anyone with a utility knife can get in within seconds.

We had a pop-up when I was a teenager and in recent years we've had everything from TTs to 37' 5th wheelers to motorhomes. If I were buying tomorrow I'd look at a Hi-Lo travel trailer. Setup is fairly easy, it has hard sides, and travel height is similar to that of a popup.