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Yes, it is actually. Using forks you can have it in your script to require certain materials & money in order to upgrade a certain weapon. It isn't that tough; although, there are more complex ways of doing this...the general idea behind is something like this:
IF PARTY POSSESESS "Copper Ore" > Wait 0.0 IF PARTY POSSESSES "$300" > Message: "I can strength your weapon now, ya losers." SHOW CHOICE > YES: > NO > ELSE > Message: "You do not have enough materials! Get out of my store!!!"
A bit lazy on my part, but something like this should be okay... ^^
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