http://www.newegg.com/Product/Produc...82E16826104577
G400 - replacement of the venerable MX518.
Or this one, which is a G400 that looks just like the ole 518
http://www.newegg.com/Product/Produc...07F7-_-Product
You will not be disappointed, even though they cost a little more than what you want to spend.