Appointments+ yearly subscription for $40

Hi

As I see it on my subscription page I have a single license for Appointments+ for 40$ per year. I would like to use it again on a clients site, but I want him to buy the plugin, but now I only see $19 per month option on the site. Did the price increase or is it still possible to get it for 40$ per year? If so than how?

Regards,
Peter