Question

Where can I find the TM's Ice beam, Blizzard and fire blast in Black??

Answer 1

Ice Beam: Giant Chasm, Forest Area
Blizzard / Fire Blast: Iccirus City Pokemart for 70000

Source

Answer 2

Ice beam-giant chasm
Blizzard-Iccirus city

Answer 3

Fire Blast: Same place as Blizzard, Iccirus City for $70,000. They sure seem to value minimum 'expensive' as like $7,000,000.