Have actually been contemplating one of those pretty hard of late; with a couple extra barrels. One of those barrels being a 410/45 Long Colt, that would afford me 1 gun with 3 barrels that would shoot 4 calibers, for under $500.
New the gun in question above, with wood stocks lists for $300 - $350, dependent upon dealer and caliber. With Laminate, and/or thumbhole stock they'll run up to $475. With synthetic they go as low as $250 MSRP meaning you can probably buy them for around $230 - $235 new at many dealers.
I won't be quite so ugly about the value of the scope, and we'll give it $15, because if you throw it on an old beat up 22, you can save that buying a new scope at Wally World for it. Bi-Pod isn't new so I wouldn't give it new price either.
Used, in good condition... I've seen a few listed recently, with a decent scope, nothing real fancy, but decent scope 3-9 x 40 / 4-16 x 50 range, for $250 - $275. And, in fact have seen a couple with decent scope and bipod in that $275 range. With that scope and bi-pod, used, I'd give it around $250.
Additonal barrels can be had if you decide to keep it. Depending on caliber they run $50 to $150. Gun less your existing barrel, has to go back to H&R, so they can fit the new barrels properly.
http://www.hr1871.com/Support/accessoryProgram.asp