How much is a new hard drive for an emachines e525 laptop *

New Dell Inspiron - 5050 with 3GB RAM and 320GB Hard Drive 15.6 inches laptop
New Inspiron 15 - N5050 Processor: Intel Celeron B815 (1.60GHz,1333,2M cache) 3 GB DDR3 SDRAM 1333MHz (2 DIMMs) 320 GB SATA Hard Drive (5400 RPM) Display: 15.6in High Definition (1366X768) WLED LCD Panel Intel HD Graphics 3000 Graphics Card Wireless : Dell Wireless 802.11g/n 8X DVD+/- RW Drive English Genuine Windows 7 SP1 Home Premium (64Bit OS) 6 Cell Primary Battery, 48W LCD Back Cover : Obsidian Black Dell Warranty