I just checked. 3 twin packs of stano plex at dps comes out to 202.32 shipped. On flexit with the blackfriday25 code it’s 175.46 shipped for 6 bottles.
When I look at HTP Halodrol: 2 twin packs on dps is 164.32 shipped. On flexit it is 179.85, so dps is cheaper for that item
YMMV, just compare...