Add to calendar link

I’ve been using AddEvent.com to to create Add to Calendar button from information from my WordPress posts.

But it is way too expensive when I exceed the limit on the Hobby account.

So anyone know of a plugin or another cheaper service to make an add to calendar button for my visitors?

I write article about tv programs and include date and time and channel custom fields info. So I just need to have my users be able to add that into their own calendar. Is quite easy with AddEvent.com but with a hard limit sadly to 50 / month.