Wow, looks like I am in the minority here. I swear by reusable! The first ones I tried were hand-me downs, then terry cloth ones. Both leaked through and were really bulky and kind of itched. I almost gave up. I tried the disposable and they irritated my nipple so bad, they were off in 5 minutes.
Then I was told about a place in Nampa, Idaho called Puffy Mondaes. They have some amazing, thin reusable pads that have a water resistant layer that goes against the bra. Even with my heavy leaking, the only time I leaked through was during full nights, or right after a dropped feeding, and then I would just wear two if needed. They are about $12 for 2 pairs and I think I got a total of 10 pairs - about $60, and that worked great. I will be reusing them again soon, so $60 for 14 months of nursing was great, and I will probably double that time again. The link that I put on here shows the layer that goes against the bra, and although you don't really see it, as it is against the breast, there are lots of colors to choose from.
Also, if you have any damage like I did, these are so much less likely to stick. If you do use any nipple creams, you will want to strip them occasionally with dawn dish soap. You also don't want to use fabric softener, as that can make the absorbent part water resistant.
http://www.puffymondaes.com/store/index.php/cloth-diapers...
I don't know if you can order online yet, but last I hear (almost 2 years ago, you can call, and they will ship it to you.)
Oh, and a note about the lillypadz. I have heard that they are great, but if the seal breaks, you can have a pool of milk spill out. Also, they don't really let your nipple breath. Don't get me wrong, I haven't used them myself, but I have heard that they aren't great for everyday use.