If you will stick to top brands like Nokia, samsung, lg, sony, motorola, spice then you should not expect a good camera phone under Rs 3,000. If you will go with the new players like Olive, videocon, karbonn, lemon, micromax then you will definitely get a good deal under Rs 3000. Let’s take some mobile phones under this category.
Top brands – Nokia 2690, Motorola-W270, Samsung Guru Dual 35 E2152, LG GS190 which all costs between Rs 2500 to Rs 2800
Other brands – Micromax-X360 (Rs 2900), Fly-V70, Olive BUZZ VG800 (Rs. 3099), Wynncom Y90 (Rs. 2499)
More details coming soon !

The list you have mentioned out here regarding the cheaper is quite impressive but the most i like Samsung guru phone..
i want best mobile in rs @3000