Awesome goal! Good luck to you. :)
I rarely buy anything new myself, for myself that is. I learned pretty early in life that my allowance bought a whole lot more used things than new things. I do have a hubby and three kids so that is a lot of stuff I can't have 100% control over. We do very well though I think.
This week my hubby bought a book on Amazon using earned gift cards from Swagbucks. When he mentioned the price, $16, I just about had a heart attack. That's probably because I'm accustomed to borrowing things at the library or buying used books at $3-10 each. Then I asked him if he'd checked for it used first. "They were about the same price" was his response. That's not the point so I educated him again. If someone has it, took excellent care of it and no longer wants it, it is better to take it off their hands than create a demand for newly manufactured goods, even if you only "save" $.05. A like new book is just what it says, like new! If it's more to buy used than new, I generally wait until someone selling used lowers their price. It is progress that he at least checked first though. :)
Just checking my receipts for this month so far all that has been purchased new is the above book, a pack of socks for my 10 year old, a couple of video game accessories, and a plush toy through Ebay. I picked up the socks but everything else was a personal purchase by my hubby or kids with allowance or birthday/Christmas money. That's pretty typical. I've bought other new-to-us items though like a stainless steel percolator to replace the two hand-me-down teapots I broke while my parents were staying with us. I paid $5 at Goodwill. I looked it up on Amazon when I got home and it was a $35 pot. This one will be harder to break. ;) My daughter also bought a used toy on Ebay with her birthday money. We practically stole it from the seller with a $1 bid with free shipping. We had researched the item together and prepared her to allow $6 to buy it so she was quite pleased at the final price. In contrast, her new plush toy cost $4. Even at her young age, I hope she's learning the same lessons I did about the value in secondhand.