Thankfully H do keep previous season's stock, that's how I scored my second Zaba in a busy dept store. Just ask for the scarf by name or model number if the store visited doesn't have it either, the computer should show all available in your territory (Europe/Asia/US/etc)
Watch out, H have had a policy of not putting out new season scarves until after the price rise. If you have a regular, nice SA or ask the SM sweetly, knowing
exactly which scarf you want so they don't have to roll them out in front of other customers (and DO NOT display it on tPF until prices rise so that all SAs are warned off for others) then they may make an exception. Contrary to that policy, new stock sometimes pops up on H.com so keep an eye open

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