They are £1.57 in Boots at the moment.
My dd loves to play with a doidy cup but needs a lot of help. She is getting the hang of the Tommee Tippee cup though. She is 9 months.
However one "side effect" of her being able to use a doidy cup means that if you go out and forget your "baby cup" she will probably manage to drink a bit out of a "normal" cup/beaker. Often children only used to bottles/spouted cups can't do that until they are a bit older.