When I was building the RHD Jeep, I was up really late for work and was looking on eBay, a set went up for $250 I think BIN and I jumped on it... brand new in box... after that (~3-4 years ago), the prices have only gone up.
I was happy to pay that price compared to what I am seeing these days.
Considering they arent actual Jeep pieces, the market for these is completely insane. I got my Postal for $650, there is no situation where a pair of non-Jeep floor mats should be anywhere close to that.
Good luck and be aware that I think there are originals (still aftermarket) and newer repros.
Its hard for me to pay a premium for these mats when I had a few re-pop sets that I purchased from 4wd.com several years ago for $99.00. I actually gave a set away a couple years ago not knowing they would be so hard to get again.
I remember them for sale back in the day around that price, too. Who could predict this market? Insane is good description.
I ran into Dennis Collins last year at their shop, and these mats came up in our discussion. Collins used to license the right to manufacture/sell them and has approached FCA on them again. However, FCA either wanted an obnoxiously high royalty rate or refused to license the Jeep name and AMC logo for the mats.
These mats aren't very hard to find. However, finding them for anywhere near what I'd consider a reasonable price is another story. You might contact Jeremy Tepper on facebook. I think he may have some he'd be willing to sell. They won't be cheap though.