My Canon QS310 electronic typewriter ribbon is always out-of-stock in our country. What other typewriter ribbons (brand/models) that are compatible with Canon QS310?

If you had posted what Country you are located in, I could have ran a search to locate someone local to you that has this product in stock. I am located in California. I could give you information on compatible ribbons which are available in my area, but they may not be available in yours and that would not solve your problem.

I would suggest that you stick with the ribbon that is made for your typewriter if at all possible? If you are unable to locate stock in your Country, try ordering the ribbons online instead.

The ribbons are available at Office Depot. They sell the product online and have your ribbon in stock. Here is a link to your ribbon on their website:

http://www.officedepot.com/a/products/914465/Canon-Model-AP11-Correctable-Film-Typewriter/

Here is a link to a website that sells both the generic and brand name ribbon for your typewriter:

http://www.fjaproducts.com/SearchMe/Department8640.asp

I hope this helps? Good luck!