My advice is to dollar average your acquisitions over time.e.g. You are spending 1000 USD, so use up $200 in five transactions in five days. That way you can ride out the downs and ups to an average. However in the long term, you are better off lumping it into one transaction and simply doing more transactions. But if you can't be sure about the long haul, then stick to the first approach. I mean, in either case you should be swarming that 1000 USB in five or more packages in standard mail anyway, since it drastically decreases the chances of getting interceptions. Packages get exponentially more likely to be intercepted as they increase in weight/size. It's kind of counter-intuitive, but this is not done because of 'personal use' laws, it's just that swarming is an excellent long term risk management strategy on many levels, especially if you have multiple addresses to ship to like the pros do.