Well, the old 'accordian' coupon holder has finally had it, and as I got far more into coupons in 2011 I have decided to go to the coupon binder. Just bought my 3 inch 3 ring binder and tab inserts for labeling sections to go into it....now need to decide which 'holder' inserts to buy. I know I'll need different sizes, but would like some advice from other couponers who have binders as to what sizes are most useful. 8? 9? 6? 3? I am thinking some 3's for larger sized coupons, but so you find the 5,6,8 or 9's to be what you use most often, for 'regular' sized coupons? TIA! Any good sources to buy these online, besides eBay? Where are they cheapest?