Can you create a DIY form to accept payments at different rates?

Hi All,


Is there a DIY form that I can use where the purchaser can select the amount they want and it will calculate?

Example:  - Our Fundraiser, we will be selling our Lottery Calendars where they can purchase more than 1.  The issue is that most people purchase more than one calendar and we have to incorporate the shipping fee in this so purchasing one calendars at $20 each will cost $23.50 for one, 2 calendars the cost will be $45.00, etc.  

I only have 5 options in the DIY - online giving, event registration, membership, contact and volunteer - none that I see where I can enter this information in (we use e-tapestry)

Does anyone know how I go about creating a form to reflect different pricing for the customers to click?

Thanks in advance! 
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