Originally Posted by Big Chin
How much would the ballasts run...?
They go for whatever price you can muster from whoever you are buying them from.
Every situation will depend but I've seen prices from around $120 to $300 pair for a pair of Hella Gen3's depending on condition.
This has been from casual observation over the past number of years from used tired mismatched worn out parts on EBAY all the way to brand new ones from vendor sites.