Simple availability calendar for multiple pages

Hey.

Im currently looking for a simple and easy calendar plugin that shows availability on certain dates. It needs to show monthly and can create multiple calendars. This is to use for a rental site and need it on different products, and needed on multiple pages. I did find one good plugin but cost like 30€. So i need a free version of this but can make more than just one.

https://wordpress.org/plugins/wp-simple-booking-calendar/