Just sorting my weekly shop - I usually get the same things every week, more or less (no adventurous eaters here!) but Tesco is suddenly out of stock of every type of banana apart from their organic versions. 
This has happened to me before; my regular, cheaper item will be "no longer available" or out of stock for a good few weeks before it suddenly appears on their site again, essentially forcing me to buy a more expensive product.
AIBU to think this isn't a coincidence or accident? Have you noticed this at all?