you aint gonna get a "power conditioner" under $100, but you can get a nice SURGE SUPPRESSOR.
Your voltage appears normal, so long as you dont get power line voltage sags to 80VAC or suffer surges from outside interferences.
I like for everyday, no-nonsense, mainstream use the TrippLite Isobar6 for ~$60 or less. Also comes in 8 and 12 outlet.
Moving up, you get into true Power Conditioners which may be voltage stabilizers or isolated transformer voltage regulators. They cost.
Balanced Power Technologies sells 120VAC units from $800 to $1100. Here's one REVIEW
Another is the Monster HTPS7000 for $1149, both balanced power and surge suppression.
PS Audio's Power Regenerator and Furman units also work on voltage regulation, IIRC.
Bruce, that Power Werks unit is designed for professional stage application; it's basically a Surge Protector (not a power conditioner as it calls itself). I've not heard about it in a home entertainment system ap.
But it has no terminals for your coax cable, which need to run thru a surge protector, too.
And it looks sorta bulky. The TrippLite I like cud sit on the floor behind your entertainment center/rack.
Bill, according to Triplite's site they do say they have batteryless power conditioners. A search on Pricewatch.com indicated some that would be in his price range. I don't know about the nature of the conditioning though, but for that matter, when i emailed Monster, I didn't get too much information either.