I just realised that you can buy an entire panini album complete with only the stickers that you need to £30. Not cheap, but probably cheaper than trying to complete a collection buying the single packets. Go to the panini website, select search, then English (or whatever language you want) and then a keyword or browse the latest few years (they have millions of albums). Look out for "Stickers complete collection". Also much more variety so for example I can never find any decent collection for my daughter. True, it taks some of the excitement away, but it could still be an incentive to potty training/homework etc if they receive only 3-4 stickers for each achievement. So in conclusion: not as nice as the thrill (or disappointment) of opening a packet, but cheaper. Basically an upgraded sticker chart. I hope it is useful.