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