Hey Kalium,
IMO; so far as cost, it may differ a bit between suppliers, and for varying reasons (breed, health, stores, location, commercial or amateur etc.) so it wouldn't hurt to ask around to work out what the "norm" is around your location(If you're part of your local bee club, I'm sure everyone would be happy to share what they think is fair).
So far as what to expect, the feller we purchased our very first 2 hives off based his price on boxes; boxes of bees and boxes of stores (he also replaced queens every 2 years). When we got ours it was late March so we opted for 3 box hives (2 brood and 1 full honey super) knowing we were not far from winter, so they were really strong and had ample stores.
In our case he was really good in explaining the exact cost of the wood ware (frames, boxes, bases and lids), wax and honey (both by weight) which made it a bit easier to get your head around the cost of the bees & queen.
I think it is easier to quantify a nuc given its usual sold in the same configuration it was made, and other than number of frames in the nuc, they all pretty much have the same recipe.
Are you looking to buy some new stock or sell your own?