Zondervan does a great job with biblical reference sets, and they have two recent ones you should be aware of:
(1) Their Old Testament Zondervan Illustrated Bible Backgrounds Commentaries (5 volumes, box set), edited by John Walton. This is a sequel (prequel?) to their 4-volume Illustrated Bible Background Commentaries on the NT, edited by Clinton Arnold. These are full-color and packed with helpful background information, and they walk through every book of the Bible.
(2) The Zondervan Encyclopedia of the Bible. This, too, is a 5-volume, full-color box set. This is an older volume, but it’s been revised and updated under the editorial hand of Moises Silva.
The links above are all to Amazon. But if you read this in time, Zondervan is offering it (until this Thursday, April 15) for 50% off and with free shipping. Go here for more details.