Ok, I realize that numbers are random, and SE does not in fact hate me(...), but I have now killed over 500 monsters that supposedly drop the Scroll of Invisible. (Yes, I've counted.) I have killed Yagudos in 2 zones, Garnet Quadavs in Bedeaux, and Goblin Leechers in 5 different zones. As you can guess, there have been zero drops.
The first assumption is, jesus christ, that guy is unlucky. And, yes, that would normally be an accurate assessment, but if you've looked at the AH prices of the scroll lately, you'll see that the price is way up there. It's between 50k and 60k on Ragnarok, with similar prices on Cait Sith before the merge.
This is a scroll that used to be so common it was often not worth even trying to put up on the AH because there were so many up. It was right up there in commonality with Sneak and Deodorize. Now it is a huge and unavoidable expense for any Mage that is very early in the game that simply used to not be there.
I don't know why the availability of this scroll has become such an issue. Perhaps no one fights the mobs that drop it (which seems unlikely considering how much competition I've had for mobs that drop it), or there have been a glut of new WHMs for the past several months, but, in any case, SE, please adjust this drop rate. This is ridiculous for such a pivotal and early spell.