I'm so sorry Dee Dee is going through another bout with staph.
Just a thought.... I did an online search on clindamycin 25mg tablets as well as virbac clintabs. It seems clintabs are only sold by the bottle but generic brand tabs you can buy however much you need (online)and they cost alot less too, about 69 cents each.
If you don't mind the generic brands, maybe you can find them more easily and perhaps the vets would be more willing to sell you by the tab.