I just ordered the shop manual (supposed to be P/N: 9Y121-01970) from Messicks. For what they're charging you'd think the manual would be in full color with a solid gold binder (it must weigh a ton as well considering the shipping charge). I paid $77.57 + $16.75 standard shipping and handling for a total of $94.32. They didn't have any in stock so I was told it may be a few weeks. I'll update this post with the color or b/w question as soon as I receive it.
I did find out, the 9Y121-01970 is all B&W and the 9Y111-01970 is the same thing with some diagrams and photos in color, and is more than twice as much $$.
I bought the WSM for my BX24, b&w photos. I am not impressed with the content.
If you are familiar with workshop manuals for cars, the Kubota is MUCH more basic, lacks detail IMO. You can download the parts manual online for free that has more detail. I wish the WSM was also available online for the time(s) you need a spec or two.