It definitely depends where you live - for example, just a couple weeks ago, Buster (my civvie) had a dental - 2 extractions and 1 root canal - yes cats can have root canals who knew - anyway, the dentist promised she wouldn't charge more than an extraction for the root canal - and as it turned out the root canal was a big job.
When she filled the canal and took xray, it was leaking out the bottom, she then had to do an incision from the outside (jaw) in to seal off the bottom of the canal and allow the stuff to settle in.
My poor girlie looked like she got in a fight and came out with a bruised chin.
Anyway, this visit cost - $ 1600 - she also didn't charge for the overnight stay. She has it set up so you can take your animal in the night before (so you don't have to rush in the am to drop off) and they give a free overnight - with tech care and monitoring. It's a convenience and easy way for them to fast the animal and for me not to have to remove food from everyone.
So, as you can see, prices range a lot, depending on where you live and what procedures the vet/dentist follows.
The one thing, when you go for your consult, ask for a written estimate - they should be able to provide it with a detailed breakdown of all the charges - my dentist does this and they give a low to high range with detailed pricing for each item.
honestly, I don't even look anymore, I just turn over the credit card and cover my eyes when signing. I so don't want to see the damages. ;-)