As well as Metro, there are Auchan, Walmart and Carrefour supermarkets. Equal is surprisingly hard to find here.
There is also a supermarket that delivers from Shanghai. On Shanghai lu just down from Pisa Pizza there will be an import deli and food market opening in August.
For certain things going on Taobao may be worth the investment. There are many ways to pay on taobao, but the safest and most convenient I found was opening a Merchant's Bank Shangye ying hang internet accessible debit card. Put enough money in for what you want to buy and use that to pay for it. When you make payments it confirms it with text messages to your mobile phone. Most shipping in china is 10-20 yuan for 1-3 day delivery. Also the prices are cheaper than retail stores with ability to find western Brand name stuff that is just not common in China. Sweeteners is just something not common here.
Here is a link to the Taobao equal search-
search8.taobao.com/search?q=equal&commen...7416_2297358_8935934
Good luck.
Simon Laing