I have been waiting for a particular item at IKEA to come back into stock for weeks. I kept checking (which you can only do by having the item in your basket and trying to check out). Standard delivery is £15. Today I checked again and initially it was showing as still being out of stock but then I suddenly saw that a new option appeared - I could have the item delivered by express delivery for £50!
To be fair to Ikea it may be that this is the premium being charged by the courier company doing the delivery but still...