Puppy prices range from about $1500 to $2000 for most of the breeders I've been considering. These are working-line dogs from titled and health tested stock with good pedigrees, and I would expect them to be able to excel in a wide variety of sports (since personally I am not interested in a dog who can't do that).
There are breeders who charge more than that for 8-week-old puppies -- if you want to spend $4500 on a puppy, there are breeders who would be happy to oblige you -- but my personal opinion is that their dogs are of substantially lesser quality. I wouldn't take one for a tenth of the cost. The breeders I know of who are routinely charging $4.5K+ for 8-week-old working line puppies are, IMO, a straight ripoff.
If you're talking about young adult or trained dogs then I don't know that market nearly as well because I have spent approximately zero time researching those, except to note that every $45K "exclusive estate protection dog" I've seen for sale on the Internet has been a bucket of lols.
ARCHMX TDCH Pongu the Insane, CD-C, RE, RL1X6, RL2X5, RL3X2 (GSD mix, b. Apr 2010)
Crookytail the Tigerwuff, RL1, ITD (Akita mix, b. Jan 2011)