Keep it in Louisiana!
No, it is not legal!
By the sound of it, Louisiana's politicians have not (as yet) hopped this particular and wholly ridiculous aspect of the "war-on-drugs" bandwagon, which is why you see glass pipes, which are referred to as drug paraphernalia, being openly sold in your state. But those retailers must be procuring the pipes locally because federal law prohibits interstate transportation of drug paraphernalia or the use of the mail service or indeed any other method to import or export and the federal penalty for the violation of this law is a prison term of three years or less plus the customary fines.
Of course, you can start a mail order catalog for glass pipes as long as the start and finish points are both within the state of Louisiana.
fredrikklaw