I have an index card box with a pack and a half of "tabs", labeled to what I need...cats, Tyson, BJs. I have yet to find a prefab one I like as much-either there aren't enough tabs, or the tabs are prelabeled differently that I prefer. I just put my "using today" coupons in the front, and if I have anything that I was going to "use today" and I didn't, I just stick it in the back and refile the next time I go through my coupons. Works great.
I have the Hannah Hansen Coupon Organizer I got on ebay new for $3 free shipping.
I just reorganized mine into a binder with baseball card holders. It took several hours to do, but is amazing! I can find coupons so easy. I had been using the nylon ones they advertise in the Sunday coupons, but I ripped them in about five months.
I got a leather one on ebay. But the manufacturer doesn't make them anymore.