For pricing information, SUSE refers people in the US to their resellers. http://www.suse.com/us/business/products/server/sles/prices.html Others, they ask to email either [EMAIL PROTECTED] or [EMAIL PROTECTED]
Red Hat has their prices on their web site: http://www.redhat.com/apps/commerce/rhel/as/#ibmz390
Generally speaking... SUSE is anywhere from 35-45% less than comparable RH pricing.... (generally).