I have a plexiglass mold I bought from Michaels. (http://www.michaels.com/artminds-soap-making-loaf-mold/10215699.html) It was $30, but I used a 50% off coupon, so it was a great deal at $15. It is made really well, but I can't say yet about how smooth the sides of the loaf will be. I have only...