For a limited time, you can buy The Ramona Collection (4 Book Box Set) for only $9.99 (57% off). Get FREE Super Saver shipping on orders of $35 or more (or with Amazon Prime). I loved these books growing up, and my younger son has read all of these too (as well as the Henry Huggins books).
If you prefer, you can order this set from Walmart for the same price with FREE in-store pickup.
This wonderful Ramona Box Set, by Beverly Cleary, contains four books: Ramona the Brave, Ramona the Pest, Beezus and Ramona, and Ramona Quimby, Age 8.
Be sure to check out all the Amazon deals that I've been posting for some great deals
Please note: Amazon prices tend to change quickly, so be sure to check the price before you buy.