Resurrecting an old thread...
I picked up an M101 CDN trailer a few weeks ago, and have been looking for a proper tarp for it. I googled and found this thread among others. Many of the retailer/surplus websites have gone offline in the ten or more years since they were referenced, but Niagara Military Parts is still in business. I spoke with the gentleman this morning at 905-732-9492 (no website); he has a few NOS still in stock. He is checking shipping to the US and will call me Monday with a quote. So far, so good - I just wanted to create a current post with his information.
Best of luck to all M101 CDN owners still looking for a tarp. I'll update with price and condition when it arrives; the tarps are all getting pretty old by now.
Pic for reference; I've since replaced the tires (those were from 2009 and had to go...).