There are 2 point of view:
1- If you order international , your package can stuck in customs but you will not have law problems. You will receive seizure letter. Thats all. If your source is good, he will sent again.
2- If you order domestic seizure between states is very low chance but danger starts on DEA. If your source is under DEA surveillance than you can also go under radar.
I heard people getting busted at home and have a search by DEA. The reason is if they will want, they can find out practically anything about your business with source.
So its up to you, a lot of people will tell you to go domestic but i dont know ... you know USA is pretty paranoid on these things...