wholecouponinserts .com
I only find it worthwhile to order coupon inserts when the coupons she has listed are better for doubling than the ones that can be found in my area. By the time that I pay for the inserts and shipping, I can just buy a newspaper here. But if there are several coupons that are different than what I can get here, it's worth buying. For instance, I might have a $1/2 coupon in my insert and that won't get doubled. But she might have a 50¢/1 coupon for the same item in her inserts and each of those will double to $1/1. So, make sure that you know where your coupons are coming from and what kind of values they have.
You can also purchase individual coupons from thecouponclippers .com. I find that they are often a better deal for me than buying complete inserts when I only want a few select coupons.