Yes, there are many options for almost overpriced mobile broadband.
China Unicom, China Telecom,China Mobile all have various packages and speeds, and coverage.
The general consensus is that the China Unicom package is the best value. You can generally find a years subscription for about 5-600rmb a year, 900ish with a USB adaptor. Its limited to I think 3.5Gig a month, but its fine for travel use.
Most computer malls will have someone with a small stand selling card+package, or you can get on Taobao.
I generally order from Taobao as its cheaper, and more trustworthy (for me)
Heres a randomly picked taobao store with different package options.http://linwensm.tmall.com/shop/viewShop ... 5083&prc=1
Suggest use google translate to see the options, then know whats available.