Burning bootloader onto ATmega chips

Searching the Internet for an AVR ISP shield for the Arduino to burn bootloaders onto ATmega chips, I see that a lot of them are no longer available. Why would this be? Is there a AVR ISP shield available that we can use with the current IDE or does anyone have a PCB design and/or circuit diagram to enable burning bootloaders onto ATmega chips?

Adafruit is selling one for $17.50 (Standalone AVR ISP Programmer Shield Kit - includes blank chip! : ID 462 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits).

However, it's often easier and a lot cheaper to build your own. There are lots of tutorials on the net, including a link to one in the page above, and basically the BOM is:

The total cost in parts above doesn't exceed US$ 6. Obviously you also need a soldering iron.

I built mine in about 1 hour.

Thank you, I'll get the shield and ZIF socket and build one myself.