One item that there seems to be a lot of in my collection in milk caps.  The picture in this post shows many of the Showalter milk caps available on the secondary market.  I have several dozens of each including two types of creamer caps.  They are a neat, compact little collectible that can be traded, sold or bought with ease.  I’ve seen some of these caps on eBay and at local flea markets.  They are also a big hit at yard sales—one generation explaining to another about glass bottles needing a milk cap.