The Producer Price Index for finished goods rose 0.3 percent in July. This advance followed a 0.1-% increased in June and a 1.0-% declined in May. Prices for finished goods less foods and energy moved up 0.4 percent in July.
The only thing I can think of would research the CPI sites.
CPI is Consumer Price Index, and lists average price specific consumes pay for basket of goods, but you may be able to narrow down data to consumer electronics.
Another tool would be looking up NPD Consumer Electronics Price Watch site.
Thanks and Regards,