>>f you travel outside the US, I believe there is a limit of $10,000 in currency and negotiable instruments one can carry<<
It is not a limit. Just one has to declare at the custom for $10,000 and above.
customs.gov "Currency Reporting
It is legal to transport any amount of currency or other monetary instruments into or out of the United States. However, if you transport, attempt to transport, or cause to be transported (including by mail or other means) currency or other monetary instruments in an aggregate amount exceeding $10,000 (or its foreign equivalent) at one time from the United States to any foreign place, or into the United States from any foreign place, you must file a report with U.S. Customs. This report is called the Report of International Transportation of Currency or Monetary Instruments, Customs Form 4790 (http://www.customs.gov/travel/forms.htm). Furthermore, if you receive in the United States, currency or other monetary instruments in an aggregate amount exceeding $10,000 (or its foreign equivalent) at one time which has been transported, mailed, or shipped to you from any foreign place, you must file a CF-4790. These forms can be obtained at all U.S. ports of entry and departure. " |