I am currently purchasing eBay pins specifically to trade at DLR and DCA with CMs. Of course, I have made the mistake of buying a pin lot in the past, sometimes we just gotta learn this lesson on our own. If you don't want to make this mistake, here is another approach to getting pins to trade with CMs at a reasonable price.
Here is what I am doing. Search on eBay for "disney pins", then on the left side of your window there are some filtering options, select: Condition = Used; Price range from $1.00 to $2.00, select "Buy It Now" and "US Only". Note: this filtering does not include shipping fees. Next, select Sort By "Price + Shipping: Lowest First. Now, when I do this, I get a list of less than 500 pins.
Here is the key, most sellers offer combined shipping and some sellers have a maximum shipping fee for multiple "wins".
As you look through this list of pins, you will notice that many of them have photos of the actual pin you are purchasing. And we all know that this is no guarantee that the pin is authentic, but it's a step in the right direction. Select a few of these pins, one at a time, and see if the seller offers combined shipping. Sometimes this is provided on the pin listing and sometimes you have to contact the seller. Once you've picked a seller, look at the "other items" they are selling on eBay. Select and buy all the pins you want from this seller and MAKE SURE that you pay for all of the items at one time. Sometimes you have to "Request total from seller" to get the combined shipping to show up on the payment window. I send them a message saying that I just "won" x number of items and that I would like to get the new total including combined shipping. Once you get the total that includes combined shipping, go ahead and pay. Then, before you know it you will get your trader pins.
Here's an example: Let's say you are going to buy 20 pins using this method. If each pin costs $1.99 with shipping costs of $2.95 each - but the seller offers combined shipping for multiple purchases that is $0.50 for each additional item. The total cost for these 20 pins is now $52.25. So the cost for each trader pin is ~$2.60.
I have seen a seller on eBay that has a maximum shipping fee of $2.85. So if you buy 20 trader pins at $1.99 from this seller the total would be $42.64 and the cost for each trader pin is now ~$2.13.
A really cool thing about using this method is that sometimes a seller will have a pin or pins that you want or just like for a very reasonable price and you can go ahead and get that pin(s) along with your traders with combined shipping. Very cool or is this hot?
Happy trading with CMs is when you know that you are putting authentic Disney pins back in the mix.