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Yup, both of my headlight relays were leaking badly when I got my car. I pulled one of them apart and repaired it, then hooked it up to both headlights and shelved the spare. Works!
I've seen new relays for $40-$70 depending on who you order from. (Zip, MA, and Ecklers all carry them) But really the only thing that goes bad on most of them is that little cylindrical rubber seal on the relay's shaft. I'll tell you how I fixed mine if you want to know.