so looking at the cart display, nothing is going into the price increment columns.
this leads me to question the recordsets for looking up the price increment values.
on this page:
https://www.familyfriendlystore.com/products-detail.php?ProductID=1000&skucolor=5&skusize=7&skuudo1=15
the select list that seams to be changing the price is the version, on looking at the source code the code for that select list is:
<select name="skuudo1" class="MenuList" id="skuudo1" onchange="this.form.submit()">
<option value="15" selected="selected">Hardcover</option>
<option value="17">Soft Cover</option>
</select>
so that means the select list name is:
skuudo1
however, in the udo1Lookup recordset, you are using the form element name:
siteCart_1_UDO1_Add
which does not match what is being used in the form.