I believe this is the cheapest I have come across the game so far, at least for a new copy.
360 - $19.53 - Sold by Amazon
http://www.amazon.com/Sonic-All-Stars-Racing-Transformed-Bonus-Edition/dp/B008OQTRYW/ref=sr_1_1?ie=UTF8&qid=1379868869&sr=8-1&keywords=sonic+racing+transformed
PS3 - $19.99 - Fulfilled by Amazon
http://www.amazon.com/Sonic-All-Stars-Racing-Transformed-Bonus-Edition/dp/B008OQTR3S/ref=sr_1_1?ie=UTF8&qid=1379869252&sr=8-1&keywords=sonic+racing+transformed+ps3
360 - $19.53 - Sold by Amazon
http://www.amazon.com/Sonic-All-Stars-Racing-Transformed-Bonus-Edition/dp/B008OQTRYW/ref=sr_1_1?ie=UTF8&qid=1379868869&sr=8-1&keywords=sonic+racing+transformed
PS3 - $19.99 - Fulfilled by Amazon
http://www.amazon.com/Sonic-All-Stars-Racing-Transformed-Bonus-Edition/dp/B008OQTR3S/ref=sr_1_1?ie=UTF8&qid=1379869252&sr=8-1&keywords=sonic+racing+transformed+ps3
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