So much to Learn! Soap Molds

I have been struggling with the unification of my soap bars. I have one wooden log mold which I like, another is a plastic mold which was okay at first but the last batch of soap I made with it the sides buckled and I ended up with a puffed out log mold. After cutting it the bars were okay but I had to trim alot of excess off the sides . Because I am going to be selling I want my bars to be uniform so I don't have a bunch of soap thats all whacky! I tried using milk cartons too which the bars turned out but are more square "ish" I have looked at Walmart, Superstore, Staples, for containers that may be suitable for makng a good soap bar but to no avail. I am getting fussy now. (to order on the internet from suppliers, is expensive at this point).
I am pretty tapped. Soaping is not a cheap hobby as I am finding out.

My hubby had a telescope box that was the perfect size and so I used that on the last batch of soap I made and got 44 bars out of it. I will continue to use that box until I can afford to get something else. You really want your bars to look the same! I may commission my hub to make some for me with some of the lumber we have around here.