All this talk about CT and Aguila, my local has it too both HV and SV at $6.49 a box, but that's 40 to a box not 50.
The stuff I bought was 50 count. Maybe the 40 grain on the label threw you off?

I just noticed the Eley Prime on the box as well. I checked the Aguila site, and this was on there:
Aguila’s rimfire ammunition uses ELEY technology, the same used by Olympic shooting teams, and clean combustible powders to offer maximum output at controlled pressures.
Grain- 40
Muzzle ft/sec- 1255
100 yds ft/sec- 1,036
Muzzle ft/lb- 140
100 yds ft/lb- 95
Was in my local CT tonight, and they had a bunch of this stuff. I might grab some more tomorrow. My guy told me that they are not even going to try and get the US stuff anymore. They are now importing this from Mexico.