How much do you need : 40M
Payment Method (pp/mb/pa/WU): PayPal
You will go first (yes/no): Yes
You added me (yes/no):Yes, skype.
You will vouch for me (yes/no): yes
Actually, you can use the website PCPARTPICKER.COM - It offers a wide variety of venders and shows prices. Can include Mail-In Rebates or without them.
Just keep in mind that it is really for reference and you would have to purchase the parts from each place.
But it's constantly being updated.