The best way to find them is to go to the No Deposit
page and look through the list.
You have to be very careful though and read the terms and conditions first. Some will claim they are cashable only to find out later there is a catch or a rule you did not abide by.
I would suggest staying away from any casino that has a warning. These casinos are rogue and the chances of cashing out are about as good as winning the lottery.
If you click on review it will indicate whether or not the No Deposit chip is cashable or not.
Also never claim 2 chips in a row as most casinos do not allow this without making a deposit in between chips.