To answer your question bluntly, yes, it would be cheaper and less worrysome to buy your daughter a dog. Plus, you seem to be having doubts on issues other than just the expense side. Breeding...even just once, is a very serious process that you should only partake in if you are COMPLETELY comfortable.
To answer your other question, here are some of the expenses you will have:
* Stud fee if you don't own the stud. Including time and research to find the right match, payment to the stud owner, which is usually several hundred dollars or a pup from the litter.
* Pre-breeding test on the female to tests for disease/problems that may be passed to the litter.
* Pre-natal care/vet bills for the mom...checkups, x-rays etc.
* Whelping supplies
* Depending on your situation, you will have to have time off from work to be with the mother during labor and the following days.
* Vet checks/vaccinations/tail docking for the pups. They will probably have at least 3 vet trips before they leave you.
* Also, you have to prepare for the unfortunate situations that can occur...a c-section should the mother have problems...hundreds as it is, triple if it occurs after vet hours, health issues with any of the pups that require treatment or even surgery, and problems that would require the bottle feeding of the pups, which is around the clock care, feeding every few hours, day and night
It is alot to consider and take on, but rewarding nevertheless if you are willing to fully dedicate yourself to it.