The molds you see listed for $40 on Cabela's are NOT CNC molds they are the sand casted aluminum molds which is why they are significantly more affordable. These molds still make great baits, they just don't have that shiny look that CNC baits do. There is a work around for this if that is a deal breaker for you but it honestly doesn't make any difference to the fish; the action of the bait and the manner in which it is presented is what counts. If you're just getting started in this hobby, I can't recommend the essential series molds enough! I have several and for the price they simply can't be beat. You can get 3 or more essential series molds for the price you would pay for just one CNC mold. Add to that the cost of your plastic, equipment, colorant, flake, etc and the expenses will add up quickly and I would hate for you to drop hundreds of dollars on something you're not entirely set on. As for the tube molds, DO It only sells single cavity molds to my knowledge but I am sure someone else will chime in soon if that is untrue.
Last but not least, welcome to the forum and to this addictive hobby! I think you will find if you decide to embark on this endeavor of bait making that the joy of catching a fish on a lure you made start to finish is well worth the time and effort!