I'm working to get some Repti-Zorb liners and talking to the manufacturer (Superior Shipping Supplies). I ordered the liners with holes for my ARS racks, although it looks like ARS changed the style of their tubs a couple years ago so there are two different hole sizes. They will send me the new liners, hopefully they will fit.
I also had them cut custom liners for my ARS boa tubs and my ARS-8010 tubs with the dimensions I provided. Looks like they are $1.04 each for the 8018 tubs and $1.36 each for the boa tub liners for 30 each. Apparently it's much cheaper if you buy them in bulk, the price per liner goes way down, but I want to try 30 each to start. Plus shipping is $17.50, seems it's a flat rate shipping for any size order. Kind of pricy but if you can reuse them it may be a better option. And with most liners they have the option of ordering 1000 at a time, much cheaper that way, but you better be sure you like them first LOL.
I'm thinking if the snakes just pee in the tub you can wash it, but if it's brown and dirty maybe throw those out. Can't be much worse than washing the sheets when the kids pee the bed LOL. I've heard of people spraying them down with Chlorhexidine before washing, maybe F10 would work too.