$100 T-mobile Refill card for $75

T-Mobile $100 Prepaid Card [T-Mobile.com]

Go to BING.com search for "T-Mobile"
Click on the first link that has BING Cash Back (with $35 off)
It takes us to T-Mobile.com
Search for prepaid card; you will be taken to the link above
Add it to cart and check out
You will receive an e-mail from Bing.com in few minutes about Cash Back
You should be able to find pending Cash Back in your bing account as I could see mine

Here is the math:
$100 Card - $100.00
Tax - $3.35
Shipping $5.99
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Total Price $109.34
Bing rebate $35.00
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Net price $74.34

I know that someone tried to recharge online and could not receive Cash Back. But, they got it when submitted to BING. This is YMMV and saves to $10 more if you go through this work around way but is a BIG YMMV.
This does not require any submissions or request to BING or T-Mobile.com