https://www.esdenera.com/en/esdenera-firewall
http://securityrouter.org/wiki/Pricing
eracks.com offers preinstalled obsd firewalls
Probably many others, but if you mean store bought consumer devices no idea but would be trivial to abstract away the OBSD complexity and offer secure remote updates if a company wanted. Why they don't, maybe it's cheaper or easier to find GNU/Linux engineers.