I was at a yard sale last week that had a lot of fabric. She had put the smaller fabrics in gallon sized plastic zip lock bags, labeled them as "patriotic", "Christmas", etc and had a price per bag. Some bags had just one piece of fabric and she stated yardage amount and price on them. Her bolts had masking tape surrounding them with a price and yardage amount.
She had about 30 of those 54 quart bins full of fabric and each bin was labeled with it's contents such as, 100% cotton, fleece, wool, statin, velvet, etc. with the bags inside. It made it very easy to go through and you didn't waste your time looking through bins that didn't have quilting fabric in it. I got a fabulous deal on her oriental fabrics.
So, if you can get your family together to help do something like this and have a large sale, advertised on CL, you should do very well and sell quite a bit of it. This sale I was at was very organized and easy to navigate, so it does take some prep work, but it was much better for buyers who didn't have the time to rummage through stuff.
Just a hint about advertising on CL. I always use the search feature and "fabric" brings up way too many posts, so I use "quilting" or "sewing" to find what I am looking for, so make sure those words are in your ad.
Diane