I have done this in the past with no problems. My female GSD was $65.00 and my male golden was $85.00 and they both had blood work. The only time I go to my actual vet is for illnesses. Shots, heartworm, etc are all done at low cost places.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD