I use a Bulldog case for my 15-22 I got from my local gun shop for around $40. It works great and I tend to agree with Phil that I buy something appropriate to the gun.

I have two Pelican cases that I use for transporting and storing my AR-15 and MSAR Bullpup. The cost of those guns and the real accessories on them make it much easier to spend $200 on a case, especially when they are getting knocked around heading to competitions and the range.