There are quite a few wholesalers who sell the end-of-season bolts on the cheap, too. If you don't need the latest & greatest, look into some of them as well. All will require that you have a resale license/tax I.D., and there are those who only sell to B&M's like you mentioned. Most will sell to you with a large enough minimum order.
You need a resale licence to sign up to view their web prices. You have to spend $250 for the opening order, $150 min/order after that, and you have to buy $1000/rolling year.
I thought that was a lot until I looked at how much I was spending at the fabric store! Well over $1000 a year!!!!
They also have cut collections you can get which are bolt ends and usually run in 5 yard pieces if you don't want to buy by the bolt (usually 15 yds). I buy by the bolt and sell my excess.
They also have lots of notions. Pretty much anything you can find in the fabric store plus tons more. and they only sell to small stores, never to the big chains, so you have unique fabrics.
You can also try UnitedNotions.com I am not sure what their minimum is for mail ordering, but if you are in the DFW area, you can go shop their warehouse. You actually take a shopping cart through the aisles of the warehouse. It is cool! It is $150 min to shop in the warehouse. They are having a big warehouse sale this month with sale fabrics from $1 - $3 per yard.
They sell Moda fabric and all the notions also. Most fabrics are about $4/ yd by the bolt.
I don't have a B & M. If you are making your own stuff you would be a manufacturer according to their categories. I even had a sales rep come visit me at my house with fabric samples from Checker. They are very good to work with. She said she had a lot of customers that worked from their home.
We carry a wide variety of fabrics for wholesale, you can see what we have on our website thefabricexchange.com and click on the menu on the left "Wholesale (by the roll)" our proces are very competitive, especially in the wholesale section.