I recently was surfing the internet, and googled free speech therapy forms. I came upon a site that I had heard of before, called "Teachers pay Teachers." I didn't know they had materials for SLPs. When I searched on that site, I found 75 listings! Some of the listings are for free things, and there are others that are listed for a very minimal charge. One of the things I really liked were the "Speech Therapy Subway Art", by the seller listed as "All Y'all Need." Here is an example of their subway art:
You need to be a member to download the materials, but that is free too, at the basic level. You can even sell things as well, once you have an account. You need a paypal account to buy the items for sale. I am so excited to have found this place!