I was wondering if anyone knew of an app that would allow customers to add an item to their cart, and have that item be reserved or saved for them for a specific amount of time.
Kind of like when you are purchasing tickets to an event and you can reserve your seats for 5 MIN, but the seats are forfeit unless you complete the purchase in that 5 MIN.
It sounds like CodersLab Reserve Cart is what you are looking for. The app serves a reminder to your customers to check out their shopping cart within a limited period of time before the product is restored back to the inventory. The app starts at $5/month and offers a 7-day free trial to see if it's a good fit for your needs. Feel free to check out their app demo here to see it in action.
If there is anything else I can help you with, please let me know.