You can save money. Here are past examples, odered from greatest savings to least.
Title then current price minus early price equals savings
The Greater Men and Women of the Bible (6 Vols.) $99.95 - $9.00 = $90.95
George Müller Collection (12 Vols.) $79.95 - $15.00 = $64.95
Bible Characters, by Alexander Whyte (6 Vols.) $69.95 - $6.00 = $63.95
Anchor Yale Bible Reference Library (29 Vols.) $549.95 - $499.95 = $50.00
The Journal of Biblical Literature (26 Vols.) $149.95 - $99.95 = $50.00
Göttingen Septuagint (65 Vols.) $349.95 - $299.95 = $50.00
The New Testament for English Readers (4 Vols.) $59.95 - $12.00 = $47.95
Day One Christian Biography Collection (21 Vols.) $195.95 - $149.95 = $46.00
Catena Aurea: Commentary on the Four Gospels by Thomas Aquinas (8 Vols.) $59.95 - $14.00 = $45.95
The Harvard Classics and Fiction Collection (71 Vols.) $129.95 - $99.95 = $30.00
Compendium of Christian Theology, 2nd ed., by William Burt Pope (3 Vols.) $29.95 - $8.00 = $21.95
The Great Christian Doctrines (3 Vols.) $29.95 - $8.00 = $21.95
Second Temple Judaism Studies Collection (7 Vols.) $139.95 - $119.95 = $20.00
Old Testament Law Collection (11 Vols.) $159.95 - $139.95 = $20.00
Old Testament Priesthood Collection (5 Vols.) $99.95 - $79.95 = $20.00
Face2face Collection (9 Vols.) $64.95 - $44.99 = $19.96
Christian Focus Biblical Studies Collection (11 Vols.) $135.95 - $119.95 = $16.00
Curiosities of the Bible: Pertaining to Scripture Persons, Places, and Things $19.95 - $4.00 = $15.95
Israel and Babylon: The Influence of Babylon on the Religion of Israel $19.95 - $4.00 = $15.95
Essays in Biblical Greek by Edwin Hatch $19.95 - $7.00 = $12.95
The Christian's Daily Walk $16.95 - $5.00 = $11.95
Bible Studies by Adolf Deissmann $18.95 - $8.00 = $10.95
The Gospel Mystery of Sanctification $15.95 - $5.00 = $10.95
Elisha Collection (2 Vols.) $39.95 - $29.95 = $10.00
Studies on Daniel Collection (2 Vols.) $39.95 - $29.95 = $10.00
Works of the Venerable Bede (3 Vols.) $39.95 - $29.95 = $10.00
Studies on 1 & 2 Chronicles Collection (11 Vols.) $119.95 - $109.95 = $10.00
Studies on Hosea (4 Vols.) $59.95 - $49.95 = $10.00
Studies on Deuteronomy (3 Vols.) $49.95 - $39.95 = $10.00
Studies on Jonah (3 Vols.) $49.95 - $39.95 = $10.00
Manual of Mythology $27.95 - $17.95 = $10.00
Theology of the Old Testament Collection (11 Vols.) $199.95 - $189.95 = $10.00
G. Campbell Morgan Collection (30 Vols.) $179.95 - $169.95 = $10.00
The Atonement: In Its Relations to the Covenant, the Priesthood, the Intercession of Our Lord $14.95 - $5.00 = $9.95
The Works of the Rev. Henry Scougal $14.95 - $5.00 = $9.95
The Antithesis between Symbolism and Revelation $9.95 - $1.00 = $8.95
The Commentary of Zacharias Ursinus on the Heidelberg Catechism $14.95 - $7.00 = $7.95
Studies on Genesis (11 Vols.) $134.95 - $129.95 = $5.00
The Greek Ecclesiastical Historians of the First Six Centuries of the Christian Era (6 Vols.) $94.95 - $89.95 = $5.00
Herman Witsius Collection (7 Vols.) $74.95 - $69.95 = $5.00
Studies on 1 & 2 Kings Collection (5 Vols.) $54.95 - $49.95 = $5.00
Studies on Ezekiel (3 Vols.) $54.95 - $49.95 = $5.00
Preaching the Word Upgrade (2 Vols.) $39.95 - $34.95 = $5.00
The Parables of Our Lord $19.95 - $15.95 = $4.00
A Practical View of Christianity $15.95 - $12.95 = $3.00
Complete Jewish Bible $25.95 - $24.95 = $1.00
Five Facets of the Balanced Christian Life (Vol. 1) $18.95 - $17.95 = $1.00
Jesus in Trinitarian Perspective: An Introductory Christology $17.95 - $16.95 = $1.00