I have an individual on another forum offering me a DX3 and 2 Spektrum 3000 receivers.

The DX3 is in great condition he says and same with one of the receivers. The other is unused and in plastic

How much are they worth and should I trade him for my Brushless Losi Desert Truck + Mamba motor and Sidewinder ESC + box of every DT part

Is it the original DX3 or the DX3.0, DX3R or DX3S?

I'd say no deal if it's the original or even the 3.0, but it's "worth" what somebody is will to pay for it.

It says DX3 on it. Is that different from the 3.0?

u can pick up that radio around 100 bucks so no i would not trade

Yes, they are different. The 3.0 is the upgraded version. For the DX3 I would not trade what you have mentioned nor for the 3.0 for that matter. Sounds like this guy is trying to pull a fast one on you. No way I would trade what you have for a DX3.