#1
so please don't ram me I'm not a singer its my first time needing to know this shit. So my band is practicing at my house and i need to sing loud enough to cover a drum. I only have like 100 bucks! Can i just get a cheap mixer and a speaker??? Does that work?

http://www.amazon.com/Behringer-802-Premium-8-Input-Preamps/dp/B000J5XS3C/ref=cm_cr_pr_product_top

http://www.amazon.com/PYLE-PRO-PADH1079-Two-Way-Speaker-Cabinet/dp/B0007LCKPU/ref=sr_1_1?s=musical-instruments&ie=UTF8&qid=1317354890&sr=1-1

this is not boutique shit but i have tube amps and my voice is not really the main part of the band. It just needs to work for practice and small high school parties. 100 max! Thanks!
#2
I would try and find a cheap used keyboard amp honestly if you are only going to run a vocal mic or two through it.
Ibanez SIR27
Pod HD500x

RIP:
Mesa Boogie Roadster 2x12 combo
Cmatmods analog chorus, phaser, tremoglo, signa drive, butah, and deeelay
walrus Audio Descent