I bought a large cheap sponge and cut it into pieces. Bought regular chalk and it ended up getting broken into bits with use. Made our own small chalkboards (from a craft store on clearance and/or with a discount coupon) and put a sticker in the corner. My mom made “mats” for us out of cardstock which she laminated and put a sticker in the corner. You can also use a piece of felt. I did buy the wooden pieces many, many years ago on eBay for pretty cheap. But you can make them out of colored foam, cardstock, and other materials. Do an internet search on ways people have done this if you’re really interested. You can use your own homemade playdough to do the “roll a letter” type activities. I only buy the student workbooks. You can figure out how to teach it just by using those. I ended up selling the teacher’s books because I never used them.
It is a simple program that’s easy to teach with little materials. The extras are just extras and it will workk without them….but there are easy ways to make your own if you want them.