I got 2 sets of these last summer at $60 each.
for when I'm doing CX or doing singletrack with my sons.
Otherwise, I'm always in Volcom shorts with UA warm weather boxers (the medium length - the long is too long and the short rolls up on my thighs and bunches near my pelvic bone); American Eagle loose fit low rise - same drawers. Never chaffing, never an issue with sweat even when I'm hustling.
I'm riding a broken in Brooks B17, for saddle relevance.