everyone I know went to using led light bars, small 6-8 inch one's and they output the OEM lights to shame, and drawm way les power, most guys I know, don't even use OEM light no more, just have as back ups, if led's ever fail
the back up one,s many tie into there reveres wires, so auto like come on when you go backwards. me I prefer a switch as some times I can use lights when doing things and not wanting to back up or??

EBay again is your best best, man they have some cheap lights these days for stuff like this
seen them as low as 10 bucks with all mounting , hardware and all!