Yes, most places allow up to a year or longer, and they will let ya know in advance befor they change. Most don't change there low denom checks though. Don't worry they want your play not a hassell...:grin:
Most casinos don't care if you buy there chips. I suggest going to the cage and buy as many as you like. They have plenty of low denomination chips and more in storage. The pit may not like you buying that many chips at the table(s) cause they would have to order a fill, to replace the ones you...