David, I could be wrong (have been twice this year) but "Blood Boudin" is not commercially available. Trichanosis (sp) the blood born disease associated with pork and health dept will not allow it to be sold. Some community fairs stil make it but it is getting rare.
Don's is my favorite, exit 103 I think. Bring an ice chest for boudin and get you some stuffed sausage bread to keep it company along with the chicken sausage (yum,yum).
Have a safe trip.