Same thing. All a Magic Eraser is is a melamine sponge, and one has a significant name brand upcharge. I have a bag of 100 of them in my closet I got for $6.63 or so. Arrived via the slow boat but they are perfect.
Edit: The ones I got are $8.99 now. http://www.amazon.com/gp/product/B00XC32NMK?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00 Still a good price on 100.