here's ones in my area (i didnt list peoria/canton since that's all ur area that u know already)
Alpha Omega Auto Sound
(217) 864-3924
3160 N Woodford St, Decatur, IL
Alpha Omega Auto Sound
(217) 824-3988
715 W Springfield Rd, Taylorville, IL
Benchmark Auto Sound
(217) 726-3835
1533 Wabash Ave, Springfield, IL
Sundown Audio Video
(217) 546-2163
4685 Wabash Ave, Springfield, IL
Vibez Performance Car Audio
(217) 352-9600
904 Francis Dr, Champaign, IL
Premier Sound & Design
(217) 355-5300
1104 N Prospect Ave, Champaign, IL
Audio Express Incorporated
(217) 423-3139
1761 E Eldorado St, Decatur, IL
Mobile Audio
(309) 454-1515
1404 Kurt Dr, Bloomington, IL
Bud's Car Stereo & Cellular
(217) 446-2204
22 N Jackson St, Danville, IL
Twisted Audio
(815) 842-2255
506 W Reynolds St, #B, Pontiac, IL
there's also several best buys around, but who knows if they would do it.