Blaberus discoidalis are entirely legal in the state of FL. Most shipping sites do not say so because they are doing a blanket ban, but call FL dept. of agriculture and talk to some of their entomologists. They're mostly concerned about dubia, turks, and some others. They gave me the green light on Discoidalis.
Although, in my area lobster roaches are also quite popular. I know a lot of locals who disregard the rules and I ... I'm in the extreme north of FL so the winters get too cold for them. IMO the real place of concern is more southern like Miami. However, I have observed wild colonies of Turkistan roaches in the summer. I'm definitly not approving of introducing species.
I kept dubia for a brief period, they didn't seem bothered by red light. I know it has no effect on lobster or discoidalis. I got 600 dubia for 60 bucks and they all got resold of fed to my Theraphosa blondi so I didn't keep them long term.