You lurked too long - the group buy deal has concluded.
My error. Sorry for the misinformation and thanks to gediehl4 for correcting that.
For threads on the IMS 4.5 tank, look in the Sweet Mods area or use the Search function. Search here works better than over on ADV (where many of us are also members) - maybe because we don't have a user base that size with a couple of million posts.