Question Summary:
Is Permissible to sell Supplies to Casinos?

Question Detail:

As salam wa alaykum 
Is it permissible to supply goods ( paper related products, like till/credit card rolls) to a hotel and casino chain (Sun International) ?
Jazakallah 

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
 
Paper-related products, such as receipts rolls for credit card till machines, are Halal in their nature and thus permissible to sell irrespective of the buyer.[1]
 
And Allah Ta’āla Knows Best
Abdullah ibn Mohammed Aijaz
Student Darul Iftaa
Baltimore, USA 
Checked and Approved by,
Mufti Ebrahim Desai.