Connections like hen's teeth

I have the spool of 250' of 12-2 MC PVC cable, but now I have to figure out a way to terminate that to an outlet box. As it turns out this is a harder prospect that I would have guessed. There are only a few things that make a weather-tight seal on this stuff, and it seems that this isn't available locally.  :-/What I need is something like this -- The problem is that it's not here, and a secondary problem is that it's expensive. I managed to buy a couple off eBay so it'll be here (hopefully) by next weekend. Then I'll be able to install the remaining two cameras. Hopefully.