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You wont find them cheap besides on ebay or from ebay sellers.
Most of the ebay sellers manufacture their own product so it saves you $$$
they chuck a different lable on the box and sell them to auto barn ect... who resells them to you for $300 more.
Ive got two ebay kits installed, a 35w and a 55w and they have been reliable.
I can also cheaply replace just one ballast if it stuffs up.
Buy a kit off ebay and stick a phillips sticker on it.