In Poundland I found some leak proof beakers (essential with toddlers) 2 in the pack for only £1. They have the same membrane system as the Anyway up cup so they are easy to clean with no fiddly valves.
Anyway up cups cost £2.99 each - these are only 50p each. They are in a range of bright colours & nice easy shape to hold. I snapped up a few packets & my kids are very happy with them. I've also noticed that the design of these does not lend itself quite as easily to having a knife or other object poked down the lid which is how my last lot were ruined by the kids!