More cashback to buy T-Mobile prepaid phone

If you're waiting for T-Mobile phone deals, you must be interested in how to get more cashback to buy a prepaid phone kit.

Commonly used cashback sites give the cash back amount as following:

FatWallet.com $5
ExtraRebates.com $7.5 (You are required to activate the phone to receive cashback.)
Microsoft Live cashback 35%.

Here is a way to use both Live CashBack and FatWallet CashBack. (Tested from IE7)

Go to www.live.com, search T-Mobile;
Click on the first link showing 35% CashBack ;
Login your live cashback account to activate 35% CashBack;
Leave this window as-is and open a new browser.

From the new browser, use the FatWallet CashBack link for T-Mobile, this will open a new window into T-Mobile.
From this window add the prepaid phone to your cart, you will see that the Microsoft Live CashBack is active during checkout.

Consider whether it is worth $5 (FW CashBack) to risk 35% live.com CashBack. The new live rules are specific about this:
"To qualify for cashback, you must make an eligible purchase at a participating merchant within 24 hours after clicking a cashback listing on Live Search cashback or a cashback advertisement on Live Search. If you open the store's website in another browser window or visit another site after clicking the eligible cashback listing or advertisement and before completing the purchase, your purchase is not eligible for cashback."

Confirmed that you will receive MS Live Cashback using the method above.