you can often find them on eBay for about $20. Just search on "Prevost".

here is one:
http://cgi.ebay.com/PREVOST-H3-45-BUS-REPLICA-MINT-NEW-IN-BOX-FREE-SHIPPING_W0QQitemZ360098062465QQcmdZViewItem?hash= item360098062465&_trkparms=39%3A1|66%3A2|65%3A15|240%3A1318&_trksid=p3286.c0.m14

There are also often models of the XL version, often painted in Dale Earnhardt colors.

Good luck,