Hi B.,
Please don't waste your money on resuable breast pads. The WORST advice I got from a well intentioned friend when I had my first baby was to buy washable breast pads. I produced so much milk that I soaked them by the half hour and they often left me embarrassed by having to walk around with big wet spots on my chest. I tossed them out and bought a box of Johnson and Johnson disposable breast pads. Wow, what a difference! They work like a maxi pad...super absorbent and no leaks! At night, you may need to double up on the pads, especially when the baby begins to sleep at longer stretches. I know lots of women want to do the "eco earth friendly way," but you will have to buy a lot of reusables just to keep up with the ones you soak, if you soak any at all. Every woman is different. Some women get a ton of milk, some not so much so I'd wait until your milk actually comes in before buying a big box of disposables. My sister had a coupon for a buy one, get one free deal and she used maybe 4 pads from only one box.
I'm going to share something with you, a personal experience I had with pumping. I think it's important enough to share here, especially since other moms may read this as well. When I had my last child 3 years ago, he had breastfeeding issues from day one. He wasn't sucking strong enough, he wasn't gaining weight, and I ultimately had to supplement with formula. It crushed me because I exclusively breastfed my first two children without ever having any issues...and neither of my first two children had a bottle...ever. And, with my first two, I never had to pump so when I had to pump with my third child, it was a new experience for me, one that I didn't like very much. My milk supply decreased due to my son's weak suck. I contacted Le Leche League immediately who put me in touch with a lactation specialist. Long story short, with what little milk I was able to pump, I stored it in the refrigerator throughout the day until I had enough to freeze, which was 2 oz or less a day from BOTH breasts (and that was with pumping every two hours for 20 minutes at a time around the clock and yes, that was double pumping...). Once I had enough stored up in my freezer, I began defrosting them to mix with the formula. What I discovered was that my breastmilk had soured once it was chilled. It wasn't anything I had done or had anything to do with how my milk was handled. Every bag of frozen milk I had was sour. I cried to the lactation specialist who told me that every woman has an enzyme in her breastmilk called Lipase. Some women have just the right amount...others, like myself, produce too much Lipase and it causes the breastmilk to sour once chilled. I was devastated to find this out as I wanted so badly to give breastmilk to my baby. While I was reassured that this sour breastmilk is not harmful to the baby, the smell and taste of it was so bad that I could not bring myself to feed it to my son. So my advice to you, before you invest in a very expensive breast pump is this: Once your milk comes in, do a trial pumping by expressing some milk and chilling it or freezing it. If it has a strong odor or bad taste to it, then you will have to flash boil your breastmilk before chilling it. This is what the lactation specialist told me. Devastated, I threw all my frozen milk away and returned the breastpump, which I was renting at the time. Flash boiling prevents the Lipase from souring the milk. And if your milk does have too much Lipase, intrestingly, the longer the milk is stored frozen, the more sour tasting/smelling it gets.
As for buying a used breastpump, you can use a used breastpump as long as you can buy the sterile tubing. Sterile tubing runs about $50. Look on Ebay...and shop around for the best value. Many blessings and enjoy breastfeeding. It was the ONE thing I looked forward to doing after my babies were born and I feel so blessed to have been able to breastfeed my first two for as long as I was able to. With my son, he eventually weaned at 9 months but by then I was barely producing any milk at all and one breast completely dried up by then. If you do run into any problems, contact Le Leche League in your area or get in touch with a lactation specialist.