Best Buy offers Source Code on Blu-ray Disc for $4.99. (Amazon offers the same price for Prime members, although it has a ship time of 10 to 13 days.) Opt for in-store pickup to dodge the $2.99 shipping fee. That's a buck under our mention from just under two years ago and the lowest total price we could find by $4, outside of the mention below.
A close price: Walmart offers it for $5. Select in-store pickup to dodge the $4.97 shipping fee.