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Re:Classic Sega Rally Arcade machine meets RC cars using Ard... by cnlwsu on Monday November 26, 2012 @10:39PM (#4835491)
xbee radios are ~20$ although there are some more expensive ones if you need 40 mile range.
Re:Classic Sega Rally Arcade machine meets RC cars using Ard... by stephengillie on Tuesday November 27, 2012 @01:18PM (#4837914)
The only ones I've been able to find are around $100~$300.
Re:Classic Sega Rally Arcade machine meets RC cars using Ard... by mmetzger on Tuesday November 27, 2012 @03:04PM (#4838633)
Some kits may be over the $100 mark, but individual radios are usually in the $20-$30 mark.

https://www.sparkfun.com/search/results?term=xbee&what=p...

https://www.adafruit.com/index.php?main_page=adasearch&q...