Hand-held heavy-duty brush cutters are available at StihlUSA.com, Lowes.com and LittleWonder.com as of 2015. Heavy-duty brush cutter attachments for tractors and other equipment are available at BrownManufacturing.us and BlueDiamondAttachments.com.
Stihl features three models of hand-held gas-powered brush cutters that vary in size and engine power. These cutters have the capability to cut through saplings and dense undergrowth or bramble. Lowes.com sells a Shakespeare brush cutter attachment that fits most straight shaft gas trimmers. The attachment features hard plastic blades capable of cutting heavy weeds and brush.
The Little Wonder Hydro Brush Cutter is a walk behind cutter that features tempered spring steel blades and a Briggs and Stratton Intek engine. The Little Wonder is capable of operating on most terrain and can clear heavy brush and undergrowth.