They're not really cheap... The only surge protectors/power conditioners I'm really familiar with are rack units which are quite expensive, such as Furman or other similar brands. Quite frankly, I really wouldn't bother. Unless you're running a multi-thousand dollar rack-based rig, it's really not worth looking into much.
Standard Strat
Jackson WRMG
Parker DF724

Axe-Fx Standard
Carvin DCM1000L

Mesa Trad. Slant Recto 4x12 (UK V30s)
Custom Horiz. 2x12 (Commonwealth 12s)