There is also a roadside vendor on lagrange (rt 75) between police station and post office. Also, near police station in fredrkstd. I paid about $7 lb. They are warm water lobster, a little different from what I'm use to stateside.
Most everyday except Sunday fresh lobsters are for sale next to McDonald's in Golden Rock (underneath the big tree). The only times during the year these roadside fish guys don't have lobster is when the seas are too rough to go out & pull up the traps.