Tommy Tippee ones have a fold away spout so you can carry them around, but are just old-fashioned sippy cups, and quite cheap. I got mine from Tesco, but I'm sure they sell them in most supermarkets / baby sections.
Well, our Tommee Tippee ones leak if you tip them upside down (as all the stains on our mattress/sofa/all over the house testify). We have a sippy cup from the pound shop too with spout but no flip-over.
Have tried all my spouted cups, none leak efficiently enough for a decent mouthfull (they seem to manage to seep easily into the carpet though)
Does it need to have a spout?
Tommee tippee have one with a lid that has a hole in top to control the flow. ''Easyflow open cup''. So it is like drinking from a normal cup rim but with the amount of liquid controlled. I have one I no longer use, if you want it.
I used to recommend a lot of ''nosey cups'' for cp kids when I was working. Don't know if still available or would be any use for your dd.
How about a bottle with a sports lid (that can be pulled out? These could be squeezed in - not good for control if any swallowing difficulties though.