Champagne is cheaper at the Finnair shop.

Whisky can be much more expensive at the Finavia one - there is a display where a 0,7 bottle sells for a moderate 21k € (!) Haven't seen many punters carrying it out in their plastic bags

I didn't know about the online voucher but the same was distributed in SVO, so I picked up a few - quite a saving with the silver 10%!

NB - the Finavia shop gives 5% discount to AY, SK and BT (status?) card holfers