Custom Rental Software

I need someone that can make me some custom web software. I need software to manage online equipment rentals. Users need the ability to browse my products like a shopping cart and select the ones that meet their needs. Requirements; *Payment via Google Checkout *Calendar Scheduling system that can allow for shipping times and also blackout dates based on inventory *Inventory management; needs to include information like serial numbers, item number, rental history, rental price, retail price, deposit amount, etc… Payment Setup; Using Google checkout, it will need to bill the custom twice. Once for the rental amount (with shipping) and once for the deposit. The Google checkout system will allow me to authorize purchases and deny them (for the deposit)