Prices have risen due to supply and demand as much as anything. There was a time when .30 Browning MG belts were given away as tie downs when someone wanted them. Today, as ridiculous as it seems original, as issued 250 round Browning cloth belts fetch as much as $40.00 or more. (I recently got some for $12.00 ea. and was quite happy)
Ruvel was one of many real "Army/Navy" surplus stores and mail order companies that abounded for quite some time after the war and well up into the the late 70's. Most seem to have disappeared or changed their name to something more acceptable, i.e. Popular Surplus became Popular Outdoor Outfitters and then went away.
The items listed for sale that are military issue surplus are listed as such.
Sportsman's Guide still sells various military surplus items today and at the same time sells items that are listed as "military style" which are not military surplus but newly manufactured. Many others today will list them as reproductions or as imported (which means reproductions)
And yes, there are still those unscrupulous people out there that sell fakes of all types,
including military surplus.
AZB