I'm a music student too, otherwise I wouldn't want a concert for anything except for cleaning windows, and I'm sure I can find cheaper things for that.
Vivaldi wrote six concertos for recorder: RV441, RV444, RV108, RV445, RV442, and RV443; and they appear to be difficult to find, so I'd appreciate help from any quarter.
Thanks!
<Added>Sorry, I've just been checking and he wrote more than six. It's just that those six are the ones I know and I thought there weren't anymore. In fact there are about a dozen more of them.