Where to find a decent HO Alternator?

[Sara]

I just bought a 2004 altima and i want to put my setup that i had in my car that i just traded in: 2 12" Kicker L7s, memphis 1500 watt amp..etc..

i can only find 2 sites on the web ohiogen and HOalternators for a HO alternator, but they want around $650 each, i had a HO in my other car, which was a gm, the site i used to buy a alt was only for gm, and it only costed me $230.

where can i get an altima HO alt on the web thats a bit less maybe $200 less then the ohiogen and HOalternator sites?

any advice would help

thanks