It's great that there is so much choice of film available.
Here in the UK, the cheapest price I can see for 5 rolls of Shanghai GP3 is £17.90 including postage. My regular supplier sells 5 rolls of my favourite film, Kodak TMax 100, for £18.99 including postage.
For me personally, it's not worth trading reliability and consistency to save £1.09, or .27pence per film. Of course, the market may differ in other countries.