I am so sorry about Lulu's diagnosis. My vet was perfectly fine with faxing the scrips to the online pharmacy when I was going through this 5 years ago with my first girl, Scarlett. He even went over (he's homecare) on his own a few times to give her the glucosamine injections at no charge when we were hoping it was advanced arthritis.
I'm holding you and Lulu in my thoughts and prayers.