Where do I find the TM for Blizzard and/or Ice Beam in HeartGold?

Question

I need to teach one of them to my Pokemon... badly XD

also is thunder a tm? if so where can I find it??

Answer 1

Blizzard

Repeatable
- Goldenrod Department Store ($5,500)

Ice Beam

Non-repeatable
- Seafoam Islands (Northeast corner of B4F)

Repeatable
- Goldenrod Game Corner (10,000 Coins)

Thunder

Repeatable
- Goldenrod Department Store ($5,500)

Answer 2

http://www.psypokes.com/hgss/tmhm.php

Both are found in Goldenrod city,

You get Ice Beam for 10,000 Coins and You buy Blizzard in the Department store for 5500 Poke.