The Riverdale target, not too far away from you, had 6 left when I was there yesterday, great selection too.
Others have mentioned the good qualities of the Revonix 360, but it is worth mentioning that the rate of fire for the Revonix is rather high. Just look at this video from FoamfromAbove:
That would actually be a pretty effective panic blaster. Can you wear that and still hold another blaster? You might want to compare the weight of a vortex disc to the pure foam ones before doing anything too crazy. I'm thinking the vortex discs might be a bit heavier - affecting flight potential and range.
The vortex disc is heavier, I am sure that it will lower the range a bit. I still think it should fly 30-40 feet though, which is still effective in some situations. I have tried wearing it and holding another blaster and it is inconvenient at best. But it is perfect for dual wealding, I am a lefty so I would have my main blaster in my left hand and this in my right.