I bought a new KHS 4 Season fat bike, immediately swapped out the stock bar and stem for more backsweep, and then swapped the bar again for a carbon one with a shorter reach.
KHS Stem: Aluminum 3D Forged, Threadless, 4-bolt, 35mm handlebar clamp, 70mm length, take-off from new bike - $10
KHS MTB Handlebar: Aluminum 35mm clamp, Riser, 760 x 15mm, take-off from new bike - $25
Ergotec M-Bar Handlebar, 31.8mm Clamp, 700mm Width, 39mm Rise, 200mm Grip Length, 16° / 0° Back & Up Sweep, Up to 180kg/396 Lb, Black Sandblasted, ported for full internal cable routing, used for less than 20 miles - $80