Zegrahm Expeditions will offer double commissions on bookings through Jan. 31, 2013.

The Seattle-based small-ship line said the offer is good on any expedition, land or sea, that leaves between Jan. 1 and June 30 of next year.

Zegrahm highlighted three itineraries: a Vietnam and Cambodia cruise; an Indonesia cruise; and a 17-day South Pacific cruise to Papua New Guinea, Yap and Palau.

Follow Tom Stieghorst on Twitter @tstravelweekly.

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