Ah, here's the post I was thinking of: How much does it cost to breed a litter?
The original post was done in 2007, so a lot of costs will naturally go up as time goes on. A C-section alone can run over $1,000 if that happens, and it can. Some of the expenses listed were for shipping dogs, and transportation for the female. The vast majority of the time, the best match for your female is not going to be a dog in your own home or kennel- so there's expenses there.
VonLuka (username WorkingK9s) posted this breakdown a little further in that thread, from 2013 (hope you don't mind me copy-pasting it, it's good info!):
"How about my current litter:
Cost to fly to the male for me - 1900.00
Cost to fly the bitch including health certficate - 580.00
Cost of hotel/rental car/food while there - 1800.00
Cost of stud fee - 1000.00
Vet care for birth (needed some oxytocin to get the last couple out then got a bit of a uterine infection) - 550.00
Tails and dew claws - 225.00
Ear crop (not done yet, but I know how much it will cost) - 3000.00
So, 9055.00 which doesn't include extra food that the female eats (she is getting 3 x the normal amount). It also doesn't include puppy food, puppy toys and other associated costs.
ETA: I will admit that this is the most expensive litter I have ever had."
Anyway, it's a good thread to get a basic idea of the costs of breeding and raising a litter- I'd read through all of it, because there's some very good info and advice there on litters. And again, if you're considering becoming a breeder, get a mentor and have someone to rely on for advice. And don't count on your family to take puppies... it's easy to say you want a dog, but when the time comes, people tend to disappear.