Is this possible?

[Kurby]

SHOP NPC:

List Banana in shop.

Trying to buy banana.

Script lists Items needed: Apple.

Then, If you don't have apple, you can't buy banana.

If you have the apple, you can buy the banana.

Any idea how I'd do this?

[Eroces]

I don't know if this will work for you but Euphy's Multi-Shop script can do that.

setarray .Currency[1],512,513,513,513,513,513,513,513;
setarray .Shop1[0],513,5,1229,20;

1 Banana will cost 5 Apples.

Edited July 16, 2012 by Eroces

[Kurby]

I don't know if this will work for you but Euphy's Multi-Shop script can do that.

setarray .Currency[1],512,513,513,513,513,513,513,513;
setarray .Shop1[0],513,5,1229,20;

1 Banana will cost 5 Apples.

Ehh, I've gave his script a look. I'm not really into that, was trying to make items need more than 1 ingredient.

His script only allows for 1 ingredient per item.

Edited July 16, 2012 by Kurby

[Emistry]

what about take a look in the script release section ?

beside...euphy got a script that can do like what you mentioned..

http://rathena.org/board/topic/64394-%E2%9C%B0-euphys-scripts-%E2%9C%B0/

check his Quest Shop script.