For Verbatim MID BD-R, look for the [B]MABL[/B] logo.
In Europe these are only in jewel cases, but in North America they are available cheaply in spindles.
As with their CD-R, Datalife discs are non-Verbatim MID. So far they have consistently been CMC (and normally of decent quality).
I’m not certain about the non-retail spindles labelled DatalifePlus. I [I]suspect[/I] they are Verbatim MID, but this has not been confirmed.