Buying used is hit or miss. Your best bet is here or DiaperSwappers, but after having bought a lot of used diapers, I won't ever do it again. People hide behind the anonymity of the internet and generally try to unload problematic diapers without telling you about it. And on DiaperSwappers, EVERYONE has 100% positive feedback... yeah, right. Generally what I have found is that people do not care for their diapers as well as you would, and even if they are not stained, you are inheriting their laundry problems. For example, we absolutely cannot use any type of Tide or we get headaches and rashes. I used to question people up and down, "Did you use Tide ever? Were you the first owner?" and on and on. They tell me, "No, no, just Allens," and then I get the diaper and I can smell the Tide wafting off it before I even open the package.
To save money, your best bet is to buy your diapers new, treat them right, and then resell them. If you buy quality, well-known diapers and treat them well, you will get about 70% of the purchase price back, depending on how long you keep them. So when you are ready to go to the next size, you will basically be getting 60% off. When I sold all my boy color FBs when I found out I was having a girl, it took less than a day and I made hundreds of dollars - b/c everyone is thrilled to buy used but good quality FB! I bought them when FBs were still $13.95 (hahahaha I am old) and used them for two boys and sold them for $12 each! They were stain-free with good elastic. The key there is to buy enough that you have a large rotation and aren't putting excessive wear on them. I never let stains sit but sun them out right away. I don't stretch them while they are still hot from the dryer, and I dry on medium.
HTH, mama. BTW, I found that response pretty funny in a bitter way! Better take your ad down before you get more "advice!" Now you learned the first lesson about being pg with your first - don't tell ANYONE ANYTHING about how you are going to raise your child, b/c to other parents, you are an idiot b/c you don't have a child yet, and they LOVE to tell you how it will never work and you shouldn't even try. Or they tell you their labor horror story. That's my favorite. So I'm here to say, you will be a GREAT parent simply b/c you are taking the time to read here on MDC, and to follow your instincts, and don't listen to bitter parents who have an axe to grind, and finally, labor was AWESOME and all three of my births were GREAT but especially the unmedicated home birth!