The Salvation army flea market at Koulutanhua 6 in Laajasalo is having a final sale with -75 % on everything. This will continue at least through March. In case you need a warm winter jacket, they have plenty of fur coats / sheepskin coats and ”ordinary” winter coats as well as a selection of skis and skates, and everything else you can imagine.
You can get there by taking the metro to Herttoniemi and then hopping on bus 84, 85, 86, 89 or 88 at least. Most of the buses going to the Laajasalo direction will pass the shopping centre i.e. ostoskeskus where the shop is located.