74LS90, 74LS92 and other TTL are OBSOLETE???

Hi
Doing a search for some TTL Logics as 74LS90, 74LS92 and others common
use Logic ICs I have found that they are OBSOLETE??? !
Basicaly I'm looking for any package of them DIP, SO and also I don't
care much if it will LS, S, HC, HCT type!
So is it real that the standard TTL Logic ICs are going to obsolete?
Regards
Sotiris

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