Sry, neither have DayZ nor Doom for you but here's some stuff I could offer nevertheless:
https://www.steamtrades.com/trade/bbcm2/h-games-n-stuff-w-some-middle-priced-games
8 years ago
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Closed 8 years ago.
New Bundles
Torchlight
Timberman
The Binding of Isaac
Any game of the Steam store (<4€ for ArmA, <5€ for DOOM)
CSGO/TF2 Keys (after 7 day cooldown of Steam market)
ArmA 2 Combined Operations
DOOM 3 BFG Edition
It is negotiable. I'll buy you any game for you if it is for less than 4€ and 5€ for ArmA and DOOM respectively.
In case you want a game, you have to go first in the gift, sorry, got scammed 4 days ago :(