One can purchase an Octave pedal from many different stores and retailers. Some examples that sell Octave pedals include Musician's Friend and Cheaper Pedals.
One can purchase an Electro Harmonix Holy Grail guitar pedal from several different places. Some of the places in which one can purchase this guitar pedal are: Guitar Center, and Amazon.
Your best bet would be to by a "pitch shifter" pedal. I wouldn't recommend trying to tune it up an octave.
There are a few online retailers one can go to in order to get a custom pedal board. One can purchase them from 'Trailer Trash Pedal Boards', 'Blackbird Pedal Boards' and 'Helweg Pedal Boards'.
There are several music stores in local towns that would sell a Boss DS1 guitar pedal. Online, a website such as Amazon will have a guitar pedal for purchase.
One can purchase a Zoom G2 1u multi effects guitar effects pedal at ZZSounds and Ebay. Also the pedal can be purchased at Amazon and Musicians Friend.
One can purchase a multi-effects pedal online from stores like eBay and Amazon. You can find exclusive deals on there and even find offers that have free shipping.
You can purchase a Behringer pedal from the official Behringer website's store. Alternatively you may find a more competitive deal from the amazon shopping website.
You can purchase a Boss delay pedal online from the Amazon website. Once on the page, type "Boss delay pedal" into the search field at the top of the page and press enter to bring up the item.
Drum pedals come in various styles and at a range of prices. One can purchase a drum pedal from Guitar Center, Sam Ash, George's Music, or Musician's Friend.
Pedal toys are available for purchase at most stores that carry toys and children's products. Currently, Walmart and Target among other stores carry such toys.
It varies but the most used effects pedals are: Boss CH-1 Super Chorus Boss DD-2 Digital Delay Boss DS-1 Distortion Digitech WH-1 Whammy Reissue Dunlop 535Q Wah Pedal Dunlop Jimi Hendrix Wah Pedal Dunlop Original CryBaby Wah Pedal Fulltone Ultimate Octave Fuzz/Octave but of course there are more
One octave above 300 Hz = 600 Hz. One octave below 300 Hz = 150 Hz.