on my site there are 2 main packages, one starting at $75 (its has a term of 6 months, and the subscription fee is $30 every 6 months) and then there is the one package which is $95 and then $50 once a year for the subscription. here on IPS it is $75 i believe with a $35 every six month subscription fee.
I prefer purchases to be on my site, as the license key and renewals are all handled automatically (no delays), but if bought from here, there can be delays (as i am not always available) as it needs to be done manually.
it's fully integrated into your site, there are no redirects to any of my servers. my servers are only there to facilitate the transfer of messages.
you can see it in action here: