I am not experienced with a soldering iron.
Soldering is not hard at all
And if you would have read the tutorial better you would have seen the option of using a breadboard instead of prototyping board. There is no soldering required in using breadboards.
Also have you heard of arduino? They are easy to program, and the boards sell for for 20-30 dollars, though it will turn the $50 robot into more like a $70 robot. I am not sure about this ,but I think the demo code will work with only a few modification.
(Arduino boards are sold every were. Like Amazon)
P.S. The Axon may seem expensive now, but in the long run it is definitely worth it.
So you might is well buy one now than later when you need a advance board that can do every thing you need.