I know of someone that may still have a brand new 56cm frameset available.
I've been riding one for a couple years and have been happy with it. The stem design, while it looks cool, isn't easy to match up with aftermarket basebars though.

I am not aware of any news that it was being discontinued. I think it is a bit under-rated as a good value

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TEAM F3 Undurance

I've been riding one for 3 years and am happy with it. Like the multisport dad said it is a good value, I thought for the price it came with better components than other bikes for the same price.

The only thing that I do not like is that I've been trying to get a rear derailleur hanger from diamondback for 4 months and they still do not have any in stock. It is a little worrisome that spare parts are this hard to get. It's a one off hanger so no one else has one either.