I bought mine at one of my local garden centers.
The big box stores didn't carry it, so I called around at just garden centers and found several in my area. I bought about the same size as what you need in black and paid less than $30.00.
I love the stuff. I made an arch out of 3/4" PVC connected in the middle with elbow and then just drapped the netting over the top and ziptied it to the kennel fencing.
Warning though - the thick heavy wet snow we had dump 2 wks ago, weighted the netting down. I fell asleep and woke up with 4" of snow on the ground.
I had to go out and hit the snow with a broom to knock it out and then just stand the PVC back up (slightly bent) and reattach the zip ties.
Good luck with your set-up.