Don Quijote (the whacky chain store in Japan that sells everything) is the only place I have seen that sells CK "Boxer Brief" style in many of their lines. Only $20 a pair too! These are identical to "Trunks" and "Low Rise Trunks" that you see everywhere now, but with longer legs. This is great for those of us with somewhat large thighs that tend to rub together
I tried out the "X" line and holy crap they are comfy. Not sure how durable they'll be though.