Ok, I see. You wont have to use a liner with this BUT there still will be times when the soap sticks. If you can manage to slide the mold off of a sticky loaf rather than peeling it away, pieces of soap being stuck to the sides can avoided. What will make it even easier is get a silicone mat, like is used in baking, and cut a piece to fit in the bottom, that will help a lot with extraction too. Freezer paper would work too. Getting the soap off the bottom pieces of linerless molds without damaging it can be the trickiest.
bebecollection.com has a selection of acrylic molds. I've never purchased from them before though.