First thing to do is make sure the ground pin on the outlets are connected and low resistance. Check the grounding rod outside for corrosion at the ground clamp. Surge suppressors don't work unless they have a good ground to divert the surge to.
I have been a long time APC UPS user. For my toys I use the 750 with 8 outlets. Buy APC Power Saving Back-UPS 750 - Technical Specifications and Information | APC
They're not expensive compared to what they do. There is cheaper stuff out there but you get what you pay for.
Check office supply stores for the best prices. Staples, Office Max, Office Depot, places like that.