Amazon has this 100 piece wooden block set on sale for just $18.95 (was $28.95). These are made of 100% wood.
*According to the reviews, these blocks are smaller than average sets, but still have high ratings.
**Shipping is free if you are a member of Amazon Prime or if you spend $35 on qualifying Amazon purchases. Prices and availability subject to change. Make sure you confirm the price prior to purchase. If the price noted above differs from what you see on line, it simply means that this deal has expired since the time it was posted.