I'm not sure how much armory base primer costs at BGs, but I think it goes for retail (I guess 6 bucks or so for a can?). Really, if you just want to prime a mini or two people will probably lend you a can.
Personally, I use Floquil over armory products, but I'm a paint snob.
Just as a heads up, I'm not entirely sure I'll be able to make it this Friday, but I'm starting to feel hopeful. I'll let everyone know my schedule by Friday at the latest (probably by Thursday). Make sure you check the forum to ensure the game is on before you make the trip, unless you wanna make the trip for something else...