Power for two subs.

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!

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

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

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.

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

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

ADD POWR POWR BAR 8 A/C strip conditioner. 

look in audiogon classified for a smoking good deal.

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

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. 

we added a whole house surge protector ! i did have a big tv fried some years ago fr lightning strike ! it was spectacular !  YES it CAN happen! ( luckily i extended the warranty and reported it the NEXT day ! ) 
good advice yes you can find what you need w/ out spending a lot ! 

this one has 8 outlets and is only $69 add a couple simple L brackets you could mount it anywhere!  a chi-com bargain! 
 Furman M-8X2 Merit Series 8 Outlet Power Conditioner and Surge Protector 

I live in the lightning capital of the United States and plug my large amps directly into the wall socket. I have a whole house surge suppressor at the meter so unless lightning hits my house then hits my electrical wiring, I’m pretty safe. Plus the large amount of insurance I have plus the warranty with the surge suppressor, I’m good.

Hey @p05129  - You do you, and that's fine.

As I've written elsewhere, whole house surge protectors are not intended for sensitive electronics.

Even with insurance, personally I don't want to send anything off for repair.

I have 2 REL subs plugged into wall and no issues...

If you want to do it inexpensive with positive results for filtering look for a used monster cable hts2000 power strip/conditioner. I run my pass amp and two REL subs off of that.

the monster cable first gen of power conditioners are good and can be had for $50 or less on eBay used.

https://audioenvy.com/product/power-cord/quad/

Perfect solution for two Subwoofers +.  

Perhaps purchase a AQ 1200 Conditioner.

ozzy

Maybe have an electrician run an additional circuit?

I just plug mine into the same outlet and I have never had an issue. 
 

You don’t need anything special to plug subs into. Even the biggest subs, I am talking 18” subs with 2000+ watts pull about 6 amps at peak power. You will listen to music at 1/10 their peak. So now power worries. In home theater with lots of gear running full tilt it could be an issue but again unlikely.