Dell sucks on many levels.
The highest level is the cost of sales tax and shipping.
The second highest level is the pricing structure they use through various sales channels (i.e. full price web dell.com, employee discount programs, dell outlet, etailers, retailers, EBay retailers) all get different prices for the exact same product.
They regularly change suppliers, so the same model number might get different manufacturer for the PSU, HDD, GPU, over the course of the product cycle for the "XPS 8500".
So, how to save money,
I suggest not buying a Dell. If you are set on buying a Dell,
1. Join fatwallet.com 's online money back program. Make sure toclick through to get the discount.
2. search out discount codes for Dell XPS desktops
3. Keep a constant eye on the Dell.com Outlet for your PC or equivalent :
http://outlet.us.dell.com/ARBOnlineSale ... l=en&s=dfh
4. Various groups get Dell discounts, such as National Association of Realtors, government empoloyees, credit union members, etc. THese "Discounts" are not real discounts usually, but sometimes with other coupons it comes out ahead... read more here:
Dell Member Purchase & Employee Discount Program (MPP) | Dell
5. Follow Dell's twitter feeds
https://twitter.com/DellOutlet
https://twitter.com/Dell
How to Receive an Additional Discount on Dell Computers | eHow.com
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My other suggestion would be to found a second tier VAR, and buy from them, again look online for discount codes, coupons and use fatwallet for 5% cash back,
cyberpowerpc.com
powerspec.com
http://www.ibuypower.com