Setting the Price
Price is a tricky one. There is a temptation – which I fell into – of undercutting the competition, but in the long run, this really doesn’t help anyone. OneBookShelf (OBS) tend to say don’t sell for under $1 (although $0.99 can help sales and makes little realistic difference). If the supplement includes artwork, especially artwork which you are unlikely to be able to reuse but costs money to buy, this can mean that a higher selling price is necessary.