I came across this today. It's text to speech with many different voices, you type out what you need and it'll say it. There are various ways to create speech files but this is the only place I've found that'll let you actually use the result in a game or application.
https://acapela-box.com/AcaBox/index.phpUK Rachel is the latest and greatest I think.
You pay by the character, it's 5 Euros for 715 characters which is probably enough for a small game/prototype.
5? 715 Characters (0m 47seconds)
15? 2250 Characters (02m 30s)
30? 4750 Characters (05m 16 s
75? 12250 Characters (13m 36 s
150? 25000 Characters (27m 46s)
300? 51000 Characters (56m 40 s)
