The really annoying thing is that there are many places that list the 115/215 in their inventory, but they're actually substituting the 116/216. So, you can't order them online, because what you may be sent is the wrong drive. Even the retail DVR-1910/2910 has had the 116/216 substituted for the 115/215 inside the box, with no indications on the outside.
So, Micro Center may not actually have the 115/215. The only way to know for sure is to buy one in-store.