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it is somewhat an oxymoron, typically you will not find a good cheap pedal of any sort, and by good what do you mean? good sounding, good as in reliable, good design and ease of use and so on... Dunlop makes decent wahs i don't know about the ernie balls... vox also (but these aren't really cheap) and then there is Morley... ferget about Mu-Tron (haha!!!) those r super rare.
i personally don't like wah (because i find that i'm unusually uncoordinated to play and simultaneausly rock on my foot to interact a good wah sound) so i can't help you much...
in the second part of your question you it sounds like you are referring to a Booster pedal which primarily increases your volume output, with perhaps a slight edge (or overdrive pending on the booster and its settings) used primarily on solos. I don't believe Cobain ever used a Booster, he initially used a Boss DS-1 (a cheap crappy pedal in stock form) then a Boss DS-2 and i think some sort of Tech21 distortion. some research and web searches and you find his effects setup...
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