According to http://www.freescale.com , they aren’t manufactured anymore. They came out in '82!
They have others in the 680X0 family, but not the 010’s. Wikipedia says they werent very popular when they came out.
You’re best bet is to hit the sites that take quotes for parts. You request a quote for however many you wanna buy, and they send you a price back. Honestly, they may not even want to deal with you for only 5 pieces. You may not find the chips directly on ebay, but you can probably find older Macintosh and Amiga systems that have them, and get those to scavenge instead. Not totally cheap, but doable.
Outta curiosity, whatcha making/fixing?