High HP b series axles?
 

Where can i find high hp axles for sale in the gta 400 hp +++

I know hasport makes driveshafts, though they get a little pricey. $800+ for application like yours.
Where to buy, only place that comes to my mind is jrp in oakville. Give them a call they may be able to get something cheaper in for you.
Otherwise just purchase online.

Driveshaft shop is another place aswell. There are a couple of shops around that deal with them.