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I know of somewhere in North Carolina if you are near by. It's probably ~100 bucks for an hour or two I think. I really don't know the price for sure, but it's more than I want to afford. Are you trying to get your truck tuned in, or are you just curious to how much power you are making?
You can try finding someone who has one of the PC HP estimators. However that is a VERY ROUGH ESTIMATE. You can also keep an eye out for a promotional free dyno day in your area. They come up here and there. Otherwise, find a dyno operator in your area, ask them for the price of ONE pull. Most of the time, they do multiple pulls, and some tuning for the $100-200 price tag. You may be able to talk someone who is not busy into 50 bux for a single pull. Cheers.
Try to connect with a diesel club in your area. Us diesel guys just love running on a dyno, and you might be able to take advantage of a package deal when they have a club function. I've run my truck on a dyno six times in the past year and a half, and the most I ever paid for a run was $45. Many times they're free, because the proprietor of the shop is trying to promote business, and sell mods.