OK, Victory.com sells the plastic in 12x24 inch sheets in lots of 10, but priced by the sheet. 10-20 sheets are @$1.50/sheet. you cut to get 3 "bolts" per sheet, so with shipping, I can get 60 for $38.80. BUT, 30-40 sheets are $.75 ea. so I can get 120 bolts for $39.92!! 50 sheets @ $.70 ea makes 150 bolts for 45.73!! Of course shipping will vary, but I wouldn't think it will be much different. I couldn't find anywhere on their website that said wholesale only. and its a little difficult to navigate...but..
Victory.com
under campaign products and services click yard signs
click blank coroplast signs
scroll and click on "order now" under blank plastic signs
scroll to 4mm 24x12 corrugated plastic (its on the right 3rd down)
go to 1st little gray "order" box (before the 'you may be interested in these products) you must order multiples of 10. Hope this helps!! I only wish I was that organized!! and sorry for the long post.