I know that this has been mentioned too many times already, and I know that you said she wants a "flip" (I'm assuming you mean folder or clamshell, not Uproar flip style), but I have to mention the Sanyo 6400. It's a really good phone and it's $55 out the door at a Sprint store (no activation required, etc.). It'll be hard to beat that.
Other than that, I've heard you can get a 5300 for under $200 at Costco (no activation).
Good luck (and I'd recommend the same to wapacz).
As the audio experience is integral to this game,
for maximum enjoyment, headphones or an ideal listening
environment are highly recommended.