This laptop is pretty good for common use
Newegg.com - Acer Extensa EX5620-4428 NoteBook Intel Pentium dual-core T2390(1.86GHz) 15.4" Wide XGA 3GB Memory DDR2 533 160GB HDD DVD Super Multi Intel GMA X3100 - Laptops / Notebooks
However, if you prefer Toshiba then get this
Newegg.com - TOSHIBA Satellite A205-S5843 NoteBook Intel Pentium dual-core T2370(1.73GHz) 15.4" Wide XGA 2GB Memory DDR2 667 160GB HDD 5400rpm DVD Super Multi Intel GMA X3100 - Laptops / Notebooks
Both laptops cost $549.99
EDIT: And here is another good laptop for $529.99
Gateway M-6319 Refurbished Laptop Computer - Intel Pentium Dual Core T2370 1.73GHz, 802.11n Wireless, 2GB DDR2, 250GB HDD, DL DVDRW, 15.4" WXGA, Pacific Blue, Webcam, Windows Vista Home Premium RB-1015356R at TigerDirect.com
Newegg.com - Acer Extensa EX5620-4428 NoteBook Intel Pentium dual-core T2390(1.86GHz) 15.4" Wide XGA 3GB Memory DDR2 533 160GB HDD DVD Super Multi Intel GMA X3100 - Laptops / Notebooks
However, if you prefer Toshiba then get this
Newegg.com - TOSHIBA Satellite A205-S5843 NoteBook Intel Pentium dual-core T2370(1.73GHz) 15.4" Wide XGA 2GB Memory DDR2 667 160GB HDD 5400rpm DVD Super Multi Intel GMA X3100 - Laptops / Notebooks
Both laptops cost $549.99
EDIT: And here is another good laptop for $529.99
Gateway M-6319 Refurbished Laptop Computer - Intel Pentium Dual Core T2370 1.73GHz, 802.11n Wireless, 2GB DDR2, 250GB HDD, DL DVDRW, 15.4" WXGA, Pacific Blue, Webcam, Windows Vista Home Premium RB-1015356R at TigerDirect.com