How often do cdkeys websites restock?

I'm not sure where to ask cause I've asked this question elsewhere and it's been taken down or ignored. My original question was worded about games in general, but it was actually about jedi knight collection (and Lego star wars tcs but that's irrelevant here) so I thought I might aswell ask here because it's more specific and probably easier to answer seen as I'm asking about 1 game instead of any game ever.

Original question (where it says I'm waiting for a few games I mean jk collection and lswtcs) :

Titles pretty self explanatory lol, basically I'm waiting for a few games on specifically loaded (cdkeys) but I don't mind buying off of other websites, the games I want are much cheaper on cdkeys but... Out of stock, they have been cheap on other websites in the past but again are out of stock. I'm too damn impatient so any input would be a massive help haha.

Is there any way to estimate or use personal experience to guess when they restock or go on big offers like they have in the past?