Expect to pay about half of what a Norton 4/8 combo costs for a barber's hone on eBay. It will be shorter than the Norton, about 5" instead of 8" and narrower, about 2" instead of 3".
Yes, you can use a barber's hone to refresh your edge for a long time, but you can do the same thing with the 8k side of the Norton, and it's probably easier since you have a larger surface area to work with.
That said, go ahead and get a barber's hone. It will add to your education, may possibly be the only hone you need, and is easily resold here on
SRP if you decide to "move up to the next level".
Rick