Craftsman Evolv 74010 10" Electric Grass Trimmer for $9.99.  Order online for in-store pickup at Sears to lock in the price and save on shipping.  Otherwise, shipping is $8.99 for a total of $18.98 shipped.  Here is a screenshot for your reference.  It features a 2.2-amp motor, 10" cut diameter, and dual-line bump-feed line advance system.