I think there’s a reward-effort ratio to deals, and while $10/$18 isn’t terribly exciting, this is a really low effort way to get free vouchers. Few simple steps: Download Harry’s app (iOS / Android)Enter referral code G41UKS6PSign up/log in to OCBC STACK and add your Harry’s points That’s it! You now have 100 Harry’s points to redeem a few different vouchers worth $10, like Cold Storage and App Store vouchers. If you’re new to STACK, you also get additional 80 Harry’s points which is worth $8 (first 2,500 customers). STACK offers great deals sometimes It’s worth nothing that STACK has occasional promos where vouchers are greatly discounted. There were $10 NTUC FairPrice and Marks and Spencers vouchers going for 50 points each (or half their usual price), but they are unfortunately out of stock. I’m in two minds whether to just get my $10 Cold Storage vouchers...