My friend is looking for a pedal that can give him the top boost ac30 sound, does anyone know what overdrives or distortions would work?
A good alternative would be an Electro Harmonix English Muff'n.

Both of the pedals actually use preamp tubes so they sound pretty ****ing awesome.
Tech 21 Sans Amp Liverpool, Runoffgroove's English Channel, Boss BC-2 (apparently "AC-inspired"), also I've heard Vox's own drive pedals sound a bit like their amps.
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Under $100?

Catlinbread CB30 maybe?
Maybe you can find one on ebay for under $100

What others have suggested would probably work too.

You could maybe stack it with a treble booster for cool sounds.