Are you sure that two weeks is a reasonable time frame? Based on the feedback I've received from several developers, I feel like the project would be a bit more involved than that. It would be wonderful if someone with programming skills could clarify this for me.
Of course - I would also charge you something around that sum, but that'll be to get a finished version. - So the quotes from others sound about right. But if I'd do it as my own project, it'd take me about 2 weeks to get the first version up - from there on I'd extend it step by step.
But I would NEVER encourage anyone to buy a developer for this kind of project, because the initial funding will only get you so far ... and trust me - there WILL be lot's of additional work to be done, you'll need money for that as well, and that's not going to come fast. And you will always have to rely on someone else to do the coding, if you can't do it.
Don't take this the wrong way, but if you are not the guy developing this, I give you about a 3% chance of this project to be happening.
I'm giving my honest opinion, not trying to discourage you and I'd love to see you proove me wrong, so the best of luck with it.