For that amount of money, Convergence could hire a fannish programmer (<lj user="guppiecat" or one of the numerous unemployed) to do it. The basic requirements are not that hard. I could do it in FileMaker (which I know better than Access) except for the "check for conflicts" part. Indeed, I made a simple Minicon Programming db many many years ago. Gave it to Don Bailey, or just printed the output and forgot about it...