Best Buy offers Ben-Hur / The Ten Commandments on Blu-ray Disc for $7.99. (Amazon has it for the same price with free shipping for Prime members, although with a 9 to 13 day shipping delay.) Opt for in-store pickup to dodge the $2.99 shipping charge. That's tied with our mention from spring and $4 below the best shipped price we could find elsewhere. This 4-disc set includes both films.
Update: The Amazon item is now temporarily out of stock, but can still be purchased at this price for delivery when available.