I was picking up some B6-4 engines at Hobby Lobby today, using a 40% off coupon. I noticed one of the new starter sets.
On the back of the box was a small picture of the new engine packs. These look to be the two-engine packages mentioned before: CLICK HERE
There were no two engine packs at my Hobby Lobby store - yet.
Two 18mm engines per package? I've always bought engines in three and four packs. I've yet to purchase 24mm engines in the newer two packs.
I don't see these as being any more efficient or less expensive.