There is a great collection of sermons by Charles Spurgeon titled Christ in the Old Testament. Even skimming through that book will show example after example of Christ foreshadowed in the OT.
Once you realize how He is hidden in there it is easy to fin him throughout.
I think this book is useful not just for Proddies, but also Catholics and EOs....
Orthodox Christians who want an orthodox apparisal of Christ in the Old Testament are, of course, better off reading Ronald Cox’s Waiting for Christ (from the classic Knox-Cox series) or Paul Heinisch’s Christ in Prophecy.
Even Fr. Richard Veras’ Jesus of Israel - Finding Christ in the Old Testament is worthwhile.