Most of the gps are manufactured by YF International. For those, they are also sold by Elebest GPS out of Singapore. You can download select firmware from their site here:
Most of the firmware is for 82A and the 480x272 PA06. The PA06HD that Lyra posted is not yet available from here.
Unfortunately, they won't release the newest firmware if you didn't buy it from them. A lot of people purchased the 6" GPS from dealextreme. Elebest calls it the EB6008B:
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