Have to disagree with ya Lone Star
A barrel from Fox Ridge is $230 without sights, $260-270 with sights I believe. Factory barrels run about $190-$210 if you shop and that is with sights. That is quite a bit of difference in my opinion for what is a factory barrel in a non standard caliber (that is my judgement, and I do won a Fox Ridge Barrel.
As far as calibers that are now gone from the standard list, 22 Mag, 222, 357 Max, 375 Win, 41 Mag, Straight 45 LC, and these are just ones that come to my mind that still seem to have a lot of interest which is verified by the high price they command on the used market.