I have subscribed to the ProSites plugin. I want to add

I have subscribed to the ProSites plugin. I want to add the Domain Mapping plugin at its public price of $19, which would take me to $38 a month.

The purchase page will not allow me to purchase the plugin separately, and instead requires me to log in and upgrade to get the plugin. the link states that the price is less than the cost of the two plugins ($38 as stated above), but is prices at over $80 on a monthly basis, and over $40 monthly on an annual basis.

At this time I cannot afford to pay annually, and do not see the value in paying over $80 a month when my needs are in the $38 a month range.

This type of confusion is what got me so frustrated I stayed away from IncSub for the past several years.

What is the offer, and where do I find it at less than $38 a month, on a monthly basis?
Kirk