There's several items available on eBay. If you search "side glow fiber optic" you'll find quite a selection. I ordered 20 meters of 4mm shipped direct from China for approximately $56.00. This should be enough for 4 or 5 machines. You'll still need an rgb driver, and these come in 1, 2, and 4 outlet configurations. I plan on 2 runs, illuminating both ends of each run, so I ordered a couple 4 outlet drivers. I plan on also ordering a few 2 outlet drivers so that I may have separate illumination, colors, and effects for each rum. Drivers run $7.50 to $15.00 each depending on configuration. I'm also going to need a 12 volt converter and the smallest clear zip ties I can find.
Cost to complete a machine will likely be $40.00 to $50.00 (and a ton of time removing and reinstalling ramps.)