ebay is your friend http://cgi.ebay.ca/2-48-x-36ft-Vinyl-Ro ... 793wt_1137" onclick="window.open(this.href);return false;FYI...
I found this site which sells the vinyl material the OP used. Now he said he got 25 yards (900") @ 48" wide. This place sells a 58" wide roll 240" long for $499. If he used most of his 25 yards, you would need at least 3 rolls at 240"x58"...the MX-3 is small...maybe only 2.
Unless you can find a way better deal than this you're looking at around $1000 I figure to do this.
2 rolls of 48" x 36ft Vinyl Rolls for Cutter Plotter with 32 Colors to choose for $135 cad, not to mention there less than an hour drive from my house . thats gotta be enough to do the car atleast twice.