You can get banned from doing this, so be careful !
Well to get free NC items you are going to need 2 things - Patience and Lucky !
With the new neopets daily click, the Trudy's Slot Machine, there's a chance of you getting a gift box every time you spin it.
So, you are going to do this : Create a new account (use a different email from your main)
Now you confirm your account
Then you are going to spin the trudy's, and here you need lucky to get a Basic Gift Box
If you didn't get one, you can try another day in this same account or create another account
Then you have to click on NC gift :
Now, you click on Receive Free NC.
If you did everything right, you have 150 NC to spend.
Now you can buy anything you want and send to your main account using the Gift Box you received from Trudy's.
I used this method to get a free Faerie Quest Cookie and Lab Ray Cookie.