Yes, DHS rubbers are genuine, at least the ones I have bought. No, the prices are not 1/2 off TT11.
I reside in N. America and when I get 30% off DHS 3 commercial and apply 30% bulk discount, it is literally $18.70 per sheet from TT11.
No, you cannot find a single sheet of DHS 3 commercial for less than $22-$23 on Aliexpress.
I have recently moved onto DHS 3 NEO provincial blue sponge and they are quite tacky still (I don't know when they will become non tacky). I get it for about $46 a sheet on Aliexpress. On TT11, with 30% bulk discount (if you buy $300 or more per order), it is about $41.22 a sheet. For that price difference, I would buy from Aliexpress to ensure I get a tacky sheet.
All DHS 3 commercial are non-tacky by now. Trust me. I have bought it from Hong Kong, Aliexpress, TT11 and Dandoy. All of them are non-tacky.
So I have moved onto DHS 3 provincial blue sponge (and Sanwei Target National) to get the tackiness.
If you are new to the Chinese rubber world, I do recommend you to start with DHS 3 commercial version. Dirt cheap and you should figure out if you like Chinese rubber or not. It is an acquired taste: either you like it or you don't. And I have lied. DHS 3 commercial version is still kind of tacky but more like hybrid tacky (like D09c, K2, K3, Dragon Grip, Joola Golden Tango, etc.). But for us loooooooong time DHS users, that amount of tackiness is rubbish. Oh well.....