Cheap case that can easily be removed?

So I'm thinking about getting the padtab system to mount my iPad to my walls and cabinets. The issue is I don't want to stick an attachment directly to my iPad. I am one who loves the design and feel of the iPad, and I normally don't like cases, but for this, a case may just be the answer. But i need a case that i can easily put on when home, and can easily be removed for when i leave the house. So am I asking the community for your suggestions. I'm looking for a case:
- costing 30$ or less
- has a smooth, flat back surface
- stable/rigid material
- can easy be taken off and placed on
- a back case only (no screen cover)

Note: iPad 3

Thanks in advance!

 

I'm going to try my luck with this one

(To mods: Not sure what links I can and can't post, but let me know and I'll remove it if needed)
http://www.newegg.com/Product/Product.aspx?Item=0B1-0016-00162

 

If I wanted to do this on the cheap, I'd put industrial Velcro on the back of a TPU case and Velcro inside a kitchen cupboard, for instance. I wouldn't expect to adhere anything to a wall that wasn't ugly for 30 bucks.