Its not a problem unless it gets seized. Seriously, chance of seizure is small and it is even smaller that they will pay you a visit on a small order-not to say it has not happened. But you can't beat domestic for safety.
I do alot of international shipping, havent really had any problems, stuff from turkey and greece tend to take longer to arrive then say, china or paraguay. Most of my sources will, at the very least, resend half the order no charge if you have a customs letter, but the majority will resend the whole thing.
Int'l is the best way to go unless you're ordering very large orders. If you have a source that resends you're fine. The good sources, ones that have been around 8-10 years in the business, rarely get seized. And price difference is ridiculous.
And oh BTW, 4 large domestics have been busted in the last year including Black Label. So anyone who thinks it's safer is kidding themselves. In other countries law enforcment doesn't even bother going after steroid sources like they do here.