As soon as you've completed the quest-line and got your Zeta-weapon you'll be able to buy replicas of all the previous states from Drake in north shroud. They wont have any stats on them but you can use them to glamour their looks!

As I said though: You need to complete the whole questline first and you'll only be able to buy the weapons you've done the quest for (as in: you'll be able to buy all the ninja-weapons but not the whm-ones unless you do the whole whm-relic-quest).
Luckly they've changed that with HW where you can buy replicas as soon as you're advancing to the next step.