That hydroponics store in Pittsfield tried charging me $400 for for a small one. I forget the exact size now though. I was not gonna be paying that much lol
I got my poly from bootstrapfarmer dot com. Paid $295 shipped and taxed. Got a 32x30 and had them cut an 20x30 into two 20x15 pieces for the gabled ends.
Got the 16ft bender from diygreenhouse for $80 shipped.
And the rest of it at jigglygreenhouse. This was the purlin to hoop connectors, wiggle wire and channel and just wiggle wire for connecting the top over the gabled ends. Connectors are $1.71 there and wiggle wire $1.75 per 6.5ft. $4.99 for the channel wire combo.
Cheapest I could find. Even with shipping this was $120 cheaper than bootstrap. Bootstrap were very friendly though. Great customer service. But $120 will buy me 10 fence top rails.