Walmart just price matched my order to Amazon including their $10 clipping coupon discount.
Here is the math:
Order from Walmart at $29.95 (Oral b 1000 white [walmart.com]
Get it price matched to Amazon [amazon.com]
Submit the rebate for another $15 off.
Total is $4.95 + taxes you paid
You can do this with the black as well but that starts at $32.95.
Personally, I did this for a previous order of the black through chat.