Doing some searching here we go and Final Fantasy VI actually cost more I thought it already had the tax included on the box 11.400 yen yes but after taxes 11,970 yen.
$ was stronger back then but if Final Fantasy VI came out today it would be $131 for Final Fantasy VI. Back in 1994 it was closer to around say $105.
Final Fantasy 13 is actually more than $90 now at the current rate its $101.69
My earlier posts for Final Fantasy series was just the retail price and didn't have the taxes included yet.
Like Final Fantasy 13 is 8,800 yen but with tax is 9,280 yen
Final Fantasy series with tax
Final Fantasy I 6,195 yen
Final Fantasy II 6.825 yen
Final Fantasy III 8,820 yen
Final Fantasy IV 9.240 yen
Final Fantasy V 10,290 yen
Final Fantasy VI 11.970 yen
Final Fantasy VII 7,140 yen
Final Fantasy VIII 8,190 yen
Final Fantasy IX 8,190 yen
Final Fantasy X 9,240 yen
Final Fantasy X2 7,800 yen without tax
Final Fantasy XII 8,990 yen
Dragon Quest I 5,775 yen
Dragon Quest II 5,775 yen
Dragon Quest III 6,195 yen
Dragon Quest IV 8,925 yen
Dragon Quest V 10,080 yen
Dragon Quest I+II remake 10,080 yen
Dragon Quest VI 11,970 yen
Dragon Quest VII 7,800 yen without tax
Dragon Quest VIII 9,240 yen
Dragon Quest IX 5,980 yen
