I purchased mine at a local pet supplier for $60 but I found it way cheaper on
www.petsedge.com.
They were the cheapest place that I found the xpen. You can save some money by also going to home depot and getting a few of the wire mesh shelf pieces to create your own closet system. A friend on another yorkie chat did that. It cost her maybe $20 in material. I wish I had thought of it myself and saved the rest of my money. You can get the pieces cut to size and they come in varying widths.
Good luck. The xpen does help a lot with confining them and giving them enough of an area so you don't feel that they are too confined.