Is there any way to reduce merchant repair costs?

Is there any way to reduce merchant repair costs? - Top view of specialized vehicles with lights on repairing road and laying asphalt and concrete at night

Since the barter skill doesn't affect the repair prices, I'm not sure if there is. While I'm not certain, I assume that all of the merchants charge equal prices for repairs. I'm approaching the vanilla game level cap of 20 and still can't afford fixing some of less common weapons such as Fat Man.

I'm aware of the Alien Epoxy, but I have no desire to start Mothership Zeta yet and this is a disposable item with limited quantity (and would be off-topic as an answer).






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