These are just a couple ideas.
Amp (as long as he still has it):
http://www.soundsolutionsaudio.com/forum/F...-CA-t35381.html
Subs:
https://ssl.perfora.net/www.ficaraudio.com/...view.shopscript
Or:
http://www.soundsolutionsaudio.com/store/p...lty-Series.html ...Had to add them.
You can browse around here as well:
http://www.soundsolutionsaudio.com/store/
Then a couple g31 batteries (Deka 9a31's are great for the price), 40 or so feet (although more can't hurt) of 1/0, fuses and fuse holders. These can all be found on here in the classifieds
Everything I've linked to can be found used around these forums in the classifieds, so keep an eye out there.
You can also search AudioQue (AQ), Incriminator Audio (IA), Fi, Digital Designs (DD), Sundown, etc to see if there is something better out there that meet your needs.