We never paid full price for a Teaching Company course, they were just MUCH too expensive for our budget. We used audio tapes primarily, and on sale they were $15-$35. You can also also find them at the library, though, so look their first. Some libraries don't list them under "teaching company" or "great courses" but instead list them under the course name "calculus made clear." It makes it harder to find that way. You can also find Teaching Company courses at used book sales and on Ebay.One year I planned to supplement a textbook with a Teaching Company course, but I didn't buy the course in time for it to be one sale. I was able to find a similar history course that WAS on sale, though, and I thought it was wonderful.
Course descriptions require a professional demeanor on paper. Your words should sound "business casual" not " yoga pants " even if you are writing professional course descriptions while actually wearing yoga pants