Here is the sticky post on surgery/anesthesia protocol that indicates IV fluids are recommended regardless of age:
http://www.yorkietalk.com/forums/yor...-protocol.html
The price sounds reasonable, especially considering your boy's undescended testicles, which requires a more invasive procedure.
I paid around $400 for Max to be neutered and have 6 baby teeth pulled, and we live outside the big city.