Hi,
To accomplish your app like Mysmartprice I have planned to integrate Groupon API / Sqoot etc.. to get different price differentiating website or price comparison.
Now, I would like to aks if you let users to buy from your app ? IF yes, what are the payment methods you would be using ?
Since you have constrained budet so I have thought to go with phonegap technology since to support the app in all devices of mobile platforms.
Let's talk.
Regards,
Mit -