http://www.denimart.com/worldjeanshop/Home_Page.html
Website sucks though, better info here and a great place to buy from, this is where I got my pair of Rockers in 39 and they were great.
http://www.contextclothing.com/item.php?id=1529
Good job on the weight loss also, keep it up. I bought these when about a year and a half ago, wore them for 6 months and loved them and then started loosing weight. I'm down to a 33" right now and it's great, but I totally get wanting nice denim in a bigger size. No reason you can rock some good jeans while you're working on the weight loss....just be careful, it gets expensive having to buy all new clothes, especially when you have to do it a couple times as you keep loosing. Try to score some stuff off the forum used because then you can often sell it for what you paid for it which makes things a little easier.
Also, I still have my 39" Jean Shop rockers in a pretty broken in state (6 months of solid wear and a few washes). If you are interested in a broken in pair for real cheap let me know, they are just sitting around now and I have nothing to do with them.