There is another net gun that doesn't seem to be as bulky and costs only $470, compared to the $3500 CODA net gun. The major cost for this other net gun is the cost of ammunition since each net round is $110, however, it's quickly reloadable unlike the CODA net gun.
http://www.nkandassociates.com/lessthan/ltlweapons.htm
or
http://www.ozarkmtns.com/less-lethal/distract.htm
I haven't used this product myself, however, when it first came out a few years back there were some videos of the net gun in use and they even showed a test on a police K-9 and due to the way the net is made, it forms a sort of web that the dog just couldn't get out of. There is a picture from that same video on the 2nd web site I listed of the dog in the net.
Jeff