Zap Calendar is available for downloaded by subscription only.  There are three subscription types available: Basic, Standard and Pro.  The table below shows the price and summary of each version:

Feature	Basic Version	Standard  Version	Pro Version
AJAX support
Repeating Events
Front End iCal Support:
event download
calendar subscription
Back End iCal Support:
external calendar import
external calendar subscription
RSS Support:
create RSS feed from calendar
e-mail upcoming events (*)
Modules:
calendar view
category controller
Plugins:
search
category controller
Z Weather Integration
Google Weather Integration
Google Maps
article (when linking events to articles)
category controller
captcha
custom event fields
iCal subscribe (for back end calendar subscriptions)
RSVP
Event Comments
JomComment Integration
JomSocial Integration
Community Builder Integration
# Plugins	2	9	15
Theme support
Application updates for 12 months
Subscription Cost (for first 12 months)**	$29. U.S.	$79. U.S.	$119. U.S.
Subscription Cost Renewal (after first 12 months)	$29. U.S.	$39. U.S.	$59. U.S.
Click the "Buy Now" button to see the price for other currencies

*: this feature is available by creating an RSS feed through feedburner.com
**: Subscription cost includes product and 12 months of updates. Zap Calendar can still be used if the subscription is not renewed, however, no new updates will be received.