Any way to keep track of sales for games you already own? (For gifts)

[Zesc]

Long story short, a certain friend gifted me INSIDE (and some hentai game for the lols).
Now, i want to git him something back of equal worth (he openly admitted he bougth both games in sale, and i see absolutely no issue in that.)

Problem is: I can not wishlist games i already own to have a notifications whenever one is in sale (and even if i could, i don't want that he can see which i wishlisted, to make it a surprise).
So... is there any way to still keep track of sales that way? Any help is highly appreciated, and thanks in advance!

[Falro the Great]

You can use isthereanydeal.com which will alert you by email when it's on sale at a number of sites, not just Steam.

[Zesc]

Originally posted by Falro the Great:

You can use isthereanydeal.com which will alert you by email when it's on sale at a number of sites, not just Steam.

Uh, thanks. Not really what i've been searching for, but that site seems handy.
Curious that they're not covering germany as greatest region in the EU...
I'll make sure to check from time to time, yet having to manually enter each game's title (not sure which one to buy) could be just as tedious as clicking througth my library and on "shoppage".