Suggestions for GPS and GPRS shield

Hi.

I eant to make a proyect that have to be very portable and I'm searching a shield that comes with GPS, and GSM (to connect to Internet). I also want to connect a battery to mu proyect.

I haver been searching but I don't find any shield that have everything that I need.

Do you know any shield with those specifications?

If there is no one,
How coul'd I make my proyect?

Thank you and sorry for my English.