That's hard man because they are such a used item here. Everyone needs them. I got super lucky once and found a guy on CL selling 7 ZD9's in Motorcraft baggies for 25 bucks. Is there any way to just run a 100 foot extension cord out from your place or are you just too far from your truck? Try not to use too much ether man. That's bad shizzle for your truck. The cheapest GP's for our trucks are the Autolites, but you're seriously playing with fire there. Maybe buy a whole set of those and 1 Beru. And then buy 1 Beru every week until you have a whole set and then get the garbage Autolites out before they swell. Might at least keep you going for a couple months...