You guys stock Vivi Novas and Nova heads!
AND it comes out cheaper after tax than most sites charge before shipping! (no, seriously, $12.96 for a 5 pack of heads is $2.59 each. I think I've seen maybe 2 sites that charged less than that, not including shipping)
My only wish: that you guys get Mini Vivi Novas and their colored tanks(plastic and aluminum)