I used VetCave as an option when ordering from my local distributor (Veterinary Supply Co.).
They were able to provide me access into their database of suppliers which allowed us easier purchasing options compared to just going through our own vendor list directly! This was great because we had multiple locations utilizing this system so it made things much more efficient since they could be using different methods/approaches without having issues communicating back & forth about who did not have certain items available yet etc...