You may want to consider contacting Greg or Newcastle, both are on this forum. I am sure they will be able to give you a ball park price for a purebred. If your budget is tight, you may have to wait until you have the money. Don’t forget it is not just the initial purchase but also the ongoing costs such as good quality food and vet bills.
As TheBoz has mentioned, it is important for the sire and dam to have been health tested, if possible also the grandparents. Dogs that have been tested do not have to be automatically healthy; it only means they have been through the process. Make sure you see the results, I am sure that Greg and or Newcastle can help you understand what “good results” are. I live in Germany; I think our methods are a little different so I don’t know what to look for by US standards.