Infinite scroll and session variables

Hi, we need to know if the price in the product box on a listing page is including tax or not but when new porducts are loaded with the ajax call (inifinite scroll) it looks like allmost all session information is lost. The information can also not be found in the avaliavle variables (so far as i can see). Anyone an idea how to keep or get those variables in the porduct box loaded when ajax loads a new set of products.