Amazon’s Kindle Store has a great deal on Colin Kruse’s Pillar commentary on Romans. The list price is $52.00, but the Kindle version is a mere $2.99. I am not sure if this is a mistake or a short-term sale. I did not see any other Pillar commentaries on sale in the Kindle store.
I reviewed this commentary when it came out, so go read my review and buy a copy of this fine resource.