Power for two subs.

I have two of the Furman PST-8. One for my system and one for my IP phone and modem. They are plugged into a gold plated outlet I got a deal on. One unit also puts a breaker on the coax signal from my antenna. 

It appears that the power cord is hardwired to the Furman?

ADD POWR POWR BAR 8 A/C strip conditioner. 

look in audiogon classified for a smoking good deal.

If you thought your preamp and poweramp for your speakers didn't need a conditioner, your subwoofer may not need one either.

I pigtailed another outlet onto existing outlet to create a single dedicated circuit for my monoblock amps and dual subs, 10AWG wire for all.

The rec given by @noromance , is sound (sic). But, make sure your circuit isn't maxed out by the other equipment on the circuit. Subs don't take that much current, but you do want to have a little in reserve.

And, if possible, get a whole house surge protector at the mains. It will make your electronics feel much better.

B

I have adverse power effects about twice a month, so none of my gear ever gets plugged in directly.  Also, while not as bad as Florida I do live in a lightning prone area. That combination means that I'm never ever plugging in gear directly into the wall.  Your risk aversion may vary.

good advice from Erik, no conditioner needed.

Note: the link takes you to options regarding the number of outlets and cord length.

i.e. 3 outlets, 9lf cord

has individual switches for each outlet

Something like this will work fine. No need for conditioners and complexity. 

Furman PST-8 is my recommendation. Filters noise, excellent surge protection and below your budget.

In general with high power appliances you want to use a power strip (not necessarily surge or conditioner) which has a built in breaker like this one. You want to avoid unprotected extension cords unless you know the wattage rating will not be exceeded. Extension cords without breakers are for lamps and table fans and not much else.  Certainly not for room heaters!