You have more hope of winning the lottery than finding a 470 at that price,stop dreaming ,if there was a 470 for that price it would be stuffed ,stolen, or run over by a 4x4 on a safari and no good anyway .Face reality if you want something good ,like all us peasants you have to .
A.save up for it and make sacrifices
B.go see the bank manager and get a loan
C.get a credit card or increase the one you have ,destroy the card, then cancel it after you have paid it off
D.sell all your crappy half arsed guns you own[like 500 grains suggests] and buy quality that works
E.buy a 410 double barrel and shoot slugs out of it
If you want a double rifle there is no easy way around it ,like buying a house ,new car ,getting married etc .Save up and buy a second hand Merkel or a Kriehoff from $7000.00