Even that big players can't track there own stock. Recently I wanted a toy at toys-r-us, but found out the only way to get it was to call every local store once a day until someone had it in stock. I paid the scalper fee and bought it on ebay. Similarly I wanted to rent a specific (more expensive) car with Avis. The only way to do it was to click on each office, put in my dates and see what they had, one by one. There was absolutely no way to search for a car to find out where it was or would be. I ended up just renting the cheapo car. You would think tracking your inventory would be a solved problem in this day in age for a company of either of these sizes.