Small number of product to sell

I have a small number of product to
sell, so a shopping cart seems like overkill.
I find there are simple web forms out there
that calculate totals every time you select products
(products are all on the same page). It's cheap,
fast and easy to use:

http://ift.tt/2qx5FTQ

The main issue I have with using the web form is
my web address does not show at the top of the
form. It's the web form hosting companies web address.

Any suggestions?