Sell for only half price in original difficulty.

src/messages.cpp

@@ -32,7 +32,7 @@ static const char *killMessage[10] = {
 	"That'll teach you!",
 	"One more for me!",
 	"Target destroyed!",
-	"You aint so tough!",
+	"You ain't so tough!",
 	"Kicked your ass!",
 
 	"That takes me up to %d",

src/shop.cpp

@@ -1005,7 +1005,12 @@ static void sell(int i)
 	}
 
 	adjustShopPrices();
-	game.cash += shopItems[i].price;
+
+	if (game.difficulty == DIFFICULTY_ORIGINAL)
+		game.cash += shopItems[i].price / 2;
+	else
+		game.cash += shopItems[i].price;
+
 	saveGame(0);
 }