First go to Lenovo Cash Back page from fatwallet.com Text
Then look for the link "NEW! $180 off Lenovo Y450 IdeaPad Laptop." under "Product Specific Coupons" (expires 11/8/09 1:59am) and click it.
It will direct to Lenovo Site.
Click continue twice if you don't need to add anything.
Click add to the cart. (it will show 729 before you apply coupon)
Enter coupon code "USPY450NOV", and click apply (729-180=549)
Tax will vary depend on the State (for CA residents add 8 recycling fee and 48.04 tax. so that total will be 605.04)
I am not sure you can still get 6% CashBack from fatwallet. if you do, it will even sweeter.

I know there is another post for Y450 laptop involving Bing CashBack and coupon.Previous Post the specification is a little bit different. I don't want to take a risk for Bing CashBack. The previous post laptop come with a little bit faster CPU T6600 2.2GHz but mine come with CPU T6500 2.1GHz and the previous come with window 7 and mine come with window vista). Then everything else is the same.

Specification

# Intel® Core™ 2 Duo processor T6500 ( 2.10GHz 800MHz 2MB )
# Genuine Windows Vista Home Premium 64
# Intel Integrated Graphics X4500
# 4 GB PC3-8500 DDR3 SDRAM 1066MHz
# 14.0 " HD Wide LED 1366x768
# Industry Standard Touchpad
# 320GB 5400
# DVD Recordable (Dual Layer)
# 6 Cell Lithium-Ion
# Intel Wireless Wi-Fi Link 5100
# None
# One year parts and labor (system battery: one year)