There are a lot of different chains available online, and prices vary widely. I would avoid any options that allow a very sharp bending radius. I printed my chains but am not 100% satisfied; it took lots of time printing and post processing for something that is very rough/crude. I plan invest in a set of IGUS drag chains the next time I have to make a wiring change. You can’t go wrong with IGUS, but they aren’t exactly cheap:
You can’t go wrong with IGUS, but like anything else you get what you pay for.