It depends on the species you want.
Bimacs for example are usually sold between 20$ and 30$. Take note that in almost any case, this doesn't include handling/shipping fees and so on.
A good recource for different species, their prices and places to order them can be found here:
http://www.dal.ca/~ceph/TCP/sources.html
Please note that the plural of 'octopus' is not 'octopi'. It is 'octopuses', or if you want to be really pedantic, it's 'octopodes'.
No, it sometimes live in cold water.
Octopi typically live in oceans and seas around the world, preferring shallow coastal waters. They are commonly found in rocky crevices, coral reefs, and seagrass beds where they can hide and hunt for food. Some species of octopi also inhabit deeper waters.
Octopi's sense of smell is detected through the suckers on their tentacles.
Octopi are animals they do not have ethnic groups.
Octopi live in different habitats between the tidal zone and up to seven kilometers depth. They inhabit many diverse regions of the ocean, including coral reefs, pelagic waters and they also live on the ocean floor.
Octopi live in the temperate regions of all oceans and the Mediterranean.
multiply its body weight by 3
maybe, maybe not. by the way. look up meez.com/foxclawbabe and that's me :)
The plural possessive form is octopi's.
Usually Two-Spot Octopi live in tide pools
Where I live they only cost about a dollar.