Get a nice used 40 Ryobi Lithium-Ion Cordless Attachment Capable String Trimmer. The trimmer is in good shape and has a brand new bottom/head.  

GAS-LIKE POWER you want, attachment capability you need. The RYOBI 40V X Expand-it Trimmer delivers power like a gas trimmer, with none of the hassle of mixing oil and gas. Attachment capability means you can add on RYOBI Expand-It attachments, saving you time, money and space. The cutting width is adjustable for longer run time or wider cutting width. This trimmer is recommended for yards up to 1-Acre.Attachment capable: accepts RYOBI expand-it attachments and other universal gas attachments to save time, money and space

• Compatible with 0.080 in. and 0.095 in. line, recommended .080 in. line

• Reel-easy+ bump-feed string head for fast and easy reloading

• Variable speed trigger for cutting control

• 13 in. to 15 in. adjustable cutting width for longer run time or wider cutting path

• 40V lithium-ion battery and charger included

• Works with all RYOBI 40V lithium batteries

N.B- Image is a stock image and is just to show what the unit looks like. As such it does not repredent the actual unit being sold.