Depending on his/your desire for adventure, he could go single or double sidemount with an AL30. A Rec or Classic xDeep wing. Not the norm, but teachable in basic and definitely streamlined and a great in water experience.
More mainline, the DirZone Kiddo sounds promising.
I've been studying import for doubles parts and for individual purchases it seems straightforward .
US import:
- USPS seems to arrive seamlessly if under $200/800/2000, or pay at post office.
- UPS/DHL/etc seem to send you bill for US duties and their (possibly high) fee.
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Internet Purchases | U.S. Customs and Border Protection