I created the following years ago for a client, ttps://www.rockermanoftexas.com, and it has been humming along with no issues until recently. It fails, sporadically, to calculate and add sales tax and it's screwing up his accounting. I have already created a new version of this website using Community Store for the very reason that this is so old and unsupported but he is now working on a new design for the website we were about to launch and it is on hold and, in the meantime, he is wanting me to see what someone would charge to diagnose and fix the sales tax issue. Please let me know.