Well...I asked my amazing husband to make the Pink Tower & Brown Stair for us. He did an incredible job!! I will say that while this was no terribly difficult to make it was very fussy and time consuming - but very rewarding. We used some new and scrap lumber that required lots of laminating and piecing to get the correct dimensions when cut down. Tons of sanding and spray painting later and voila!! Now you can also leave these natural if you so desire...many are sold that way as well - I just chose to paint them. To see one in unfinished wood look here .
I printed all of the extensions and made a couple with construction paper Bristol board and my favorite all time thing I found on another super mom's blog...clear contact paper by the roll at Walmart for 10bucks!!! You can laminate durably - a ton of print work...love it!!
I did purchase the cubes and prisms extensions from Alison's Montessori (great price)- for later use.
Montessori Print Shop has many amazing sonsorial extensions and command/activity cards.