If your chess club plays in a room like a school cafeteria that has a hard floor, then, over time, you may have several broken pieces to replace. You could always buy an entire new set of pieces from a chess supplier like WholesaleChess.com or US Chess Federation Sales, but kings and rooks seem to be more fragile than other pieces, so you probably need to replace more of them.
I recommend ChessHouse.com for replacement pieces, because they sell individual solid plastic pieces at reasonable prices and with good service. They give you a bulk discount if you buy 100 of any combination of pieces, have coupons that give you an additional $5 off orders of $25 or more, and offer free shipping if your order is large enough.
For more information, please see “Buying chess sets and equipment.”
Please leave a comment if you have found other good suppliers of replacement pieces.
Indermaur Chess Foundation 