Need a new alternator with more power, Lights dim:( Options

[Legit94GT]

Well i put in my sound system quite awhile ago i guess and after i broke everything in and finally bought an i pod for it, i realized that when i have it cranked way up at night all my lights dim:(

I know this is because my alternator isn't putting out enough juice, so i need to upgrade it to put out more.
I have called a few shops and no-one wants to build me for less than like 600 dollars, or sell me a "high output" one for around the same... I was thinking that this would only cost like $2-300...

Is getting a bigger alternator really that expensive or am i just looking in all the wrong places?
Anybody have a useful link or company name let me know:)

thanks
alot

[brthrurik]

I did the "Big 3" and noticed a difference in the dimming but I still replaced my alternator with a 130 amp reman. from Eagle Auto Electric. I got lucky on Ebay, paid 110$ with shipping, works fantastic and puts out approx 75 amps at idle...