If you want a Randall, buy the Randall. I've owned a few copies vs their real examples, and they are always off just a tad or if they are really close, the difference in price wasn't that great that it made sense to buy the copy.
If you are buying close to Randall's actual book price, you are paying about right. If you are paying the big "Randall Tax" some collectors ask on current models, you might be disappointed. Spend some time to learn who are actual Randall authorized dealers, then spend a little more time figuring out which are selling near or at Randall's book price and go from there. Like many things there are levels to their dealers.
Also Randall has a shop sale the 2nd Monday of April where they get rid of odds and ends that went unpaid for, if you have a idea what you want, you might get lucky there. There is one in October too.
You are paying a bit for the name, but they are fine knives none the less.