Three models in the alibaba link, comma for isolation:
DP832A = 30V 3A, 30V/5V 3A
DP832 = 30V 3A, 30V/5V 3A
DP831A = +/-30V 3A, 8V 5A
There is a small black line drawn between 30V and 5V ground jacks, indicating connection.
DP832A/DP831A are $740-770 (close enough to $849 for DP1308A in NA)
DP832 is $415 (so maybe $500 for NA)
The 832 has either red or green monochrome LCD depending on which sellers pictures you look at (taobao). I don't see any other differences in specs/features, kind of surprised that only color LCD would add $300+ to the price though.
DP832 seems like it could be a good deal.