You find 2 of them at the surf shop in the mall.
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The boxes are just laying around on the floor. You don't need to kill any creatures (click on them to collect them).
While at the mall, look over at the podium with the lady. Under her is a link for the tree house accessories. The hair gel is in this section. -e
gel
In the first part before you enter darkovia, down in the well
got, god, get, goo, gob, gym, gel, gas