I was there last year, and believe me, there is no shortage of fireworks........  don't know if you can get them and set them off.  

Think I do remember seeing them for sale.

I bought fireworks, the fuse was too short. I'm lucky I still have a face. My GF said I could not use them.

There even is or was a huge fireworks market in Guangzhou itself, not too far from the Tian He Coach Terminal.  That being said, this year, at least officially, the Guangzhou City Fathers have embarked upon a campaign of no fireworks during Spring Festival, and I don't doubt for one minute that that will change anything.  If the local police are vigilant, you may be fined -- if it is business as usual, well then.

I always bought fireworks on the street corner. Don't forget to bargain a little too. Actually, when the time comes, you won't have to look very hard...  fireworks will find you. 

Last year for New Years I saw zero fireworks for sale, and at midnight there was nothing on the sky. That is of course a local "problem" For Chinese New Year it is a different story. 

Allowed to? I thought it was compulsory!

Honestly, in Nanning in Spring Festival, every street has hundreds of firework sellers and they are set off on almost every street corner with absolutely zero restrictions. Apparently about 3 years ago they tried to ban it but 5 million locals effectively said "f*&k you" and ignored the authorities so that 'instruction' quietly died.

Be warned though, as stated above, the fuses (especially on the ubiquitious firecrackers) are very short, light and run, or at least get your head out of the firing line.