I can't comment on the Blackhawk shorts. I don't know how "tactical" they are...
I buy my shorts at Goodwill. They're 3-4-5 bucks a pair. I have maybe 30 pair. If they get destroyed during tactical maneuvers (Hmmm), I've got plenty of BOS (back us shorts). They come in tactical black, a dozen styles of camo, coyote tan, desert tan, dark earth tan, faded tan, and beige.
Toughest part about those Goodwill shorts is getting the darn smell of Febreze out of them.
Sgt Lumpy