Apparently it is nearly impossible to purchase matte black bike fenders in the US.
If you’re into the hammered metal look there are Handsome Cycle’s Mud Butler Fenders for $65.
If hammered metal isn’t your look, you want a pair of SKS Bluemels Mudguards but you need to order them from the UK for about £23.39. With shipping they’re not actually too expensive.
Or you could get these SKS Alley Cat Full Coverage Bicycle Fender Set which look just like the Bluemels.
I ordered the Bluemels…
p.s. fender manufacturers, black matte fenders look so much better than glossy black, make more!