I was checking out their webpage and noticed the new frameset was onsale for $399 including tax. Looks like its $448 shipped, until tomorrow (October 1st).
I still haven't ridden one of these but that seems like a great deal for the price-conscious cargo rider.
Mundo Cargo Bike Frame set V4.0 - Yuba Bicycles Shop
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Yuba Mundo V.4 Frameset on sale!