Well, I'm always hunting for bits and pieces. I know a few place around here have them, but the price is generally capable of producing knots in the gut, if you know what I mean. I can ask Benz Friendz when I call over there later. I've been meaning to ask him if I can get a slight discount for buying ten or fifteen injector cores instead of just five.
Sometimes, the chain of Pull a Part yards around here have Mercs. They're usually pretty crappy, and get picked over hard and fast by the natives, but they do sell speedometers for $6.50 plus tax. I managed to not only pull one for that price a while back, but also escaped the angry natives that felt they were more deserving of the parts because they had seen them the day before and had returned for them only to find me unbolting them.
I'm warning you, though. If I find you one and get shot over it, I'm charging you double what it cost me!