LOL, that is because the sippies and toddler spouts are the ONLY things made by avent that are BPA free (well, except their not so popular disposable line)
Follow this
link and click on the link "Product Materials Chart" and a chart will come up of all Playtex products, if they have BPA, and what exactly each piece is made of. The Sipster and Insulator (the cups I have pictured above) have always been BPA free and made with a "safe" plastic.
Babierus's
BPA free solid feeding section also has the Playtex cups included (just not the style that is 3.52) Not all of the current bottles/sippy cups contain BPA.
It doesn't take anything special to be BPA-free. It just needs to be the right plastic. LOL, the cheapie old-style gerber and evenflo bottles are BPA-free and my mom used them.
Its just finding out which are BPA free and which aren't.
ETA: Oh, yeah, and that free BPA bottle from Playtex form still works. I have gotten one and my sister just ordered on a couple of days ago.