I had an easy pay code a while ago and used it to order a TSV auto delivery, and the website accepted it. TBH it was a pain because I kept seeing the installments and for a split second forgot what they were for.
The recent Leighton Denny TSV is good because there's variety in the contents. In the past I've had a Laura Geller TSV and ended up with 3 "bone" eye pencils, and the Summer 2014 Laura Geller TSV had 3 drops with the same "honey lavender" highlighter which is bonkers, however I only kept one of the drops but 3 highlighters - I'd be leaving 2 to my descendants with the family silver!
Years and years ago Q did an auto-delivery of Gale Hyman's Lip Lift and after the first delivery the postage was either free or much reduced. Now that kind of AD might be more tempting but generally if it's a TSV that I want multiples of, I'd rather buy 2 with easy pays than set up an AD.
ahh easy pays that are not that easy they soon add up