In reality, I charge even less at author events than the prices that are listed online: http://www.drkarenpetit.com/purchase.html. The reason for last night's dream may have been the really unusual prices that are occasionally listed online. The picture in this blog post shows what was being charged for Banking on Dreams in September 2017: $997.09. The current prices listed today on amazon.com for Banking on Dreams range between $3.99 and $31.44 (plus shipping).
Another reason for this dream may have been a different dream that I had last weekend. I was shopping with my kids when they were young, and we went to a place in the store where a layaway booth was located. The booth was in a tiny closet with an ancient cash register. I tried to buy a cell phone and asked my kids if I could pay for the phone by using the phone for the purchase. This dream was interesting because it showed my lack of money, as well as how my kids were helping me. It also showed a connection between my past (when items were paid for by layaway payments) and my present (when more technology is available).
Having two money dreams within a week is interesting, especially since one showed things being expensive, and the other one showed items being purchased more cheaply via a layaway plan.