I purchased my U30GT from this store.

http://www.aliexpress.com/store/100712

They are correct and fast suppliers. You need to register in Alibaba first.

(It is probably the largest marketplace, so you find almost anything.)

As I see they dont have U30GT2 recently, only U30GT1.

If you search on the model name on Alibaba, you will se loads of offers, some of them with good price and cheap shipment. If you don't want it to go through customs, most suppliers send the tables as e-book reader with a lower price in the customs declaration. If you want to do this, choose China Post Mail, Or HongKong Post. This takes more time, but you have better chance to bypass customs. If you choose DHL, UPS or other parcel services you will have to pay duties and taxes for sure (and the shipment is expensive too).

If you look for screen protector, this is where I bought mine:

http://www.aliexpress.com/snapshot/271886186.html

You get 5 for 10 USD with fre shipping.

If you look for a protective cover, I suggest this:

http://www.aliexpress.com/snapshot/273126206.html

Also ten buck with free shipment.

I purchased mine here:

http://www.ahappydeal.com/product-124623.html

I have bought several items with them, not a single problem. However, I have always chosen items with "ships in 24 hrs", as this flag seems to indicate a real stock. The U30GT2 does not have that flag now.