L.R.
There are cups made by the first years. They come in a package of two. However, don't boil or put them in a dishwasher. This causes them to leak. These were the best sippy cups we found. They don't have any inserts to lose either. They also have cute designs. Here is the sesame street design just to show you what the actual cup looks like. I love these the best. We have been through so many also.
http://www.thefirstyears.com/products/product.asp?pValue=...