Hoover stick vacuum filter bags .

Did you check $ and surplus/liquidation stores? My bags were 1/4 or even less of the price of the name brands. They often sell universal bags.

What is the model #?

Don't substitute. You'll usually regret the difference in quality or find the fit is sub-standard.

Have you checked Amazon.com?

How much do they cost?

On Amazon it was $18.00

I did a search for you. Check this out...It says it sells to individual customers.

https://www.webstaurantstore.com/type-s-vacuum-bag-for-hoover-canister-vacuums-pack/430C645.html

You have to buy in lots of 25, but think of the money you will save in the long run.

I haven't read the fine print.

Compare it to this:

http://www.usavacuum.com/Hoover-Bags-USA-VACUUM-s/26.htm

Have you tried Amazon?

Sorry Mog, didn't see that you mentioned Amazon.Com. Was typing the same time you were. I have gotten things there that I could not find anywhere else. She, have you tried vacuum repair places? They may be able to tell you where to get your bags.

I actually carefully wash my filters. They can washed many times before needing replacement. I use blue Dawn water. Make sure it's thoroughly dry before using!

You can get away with washing them for while, here's a link to buy a new one

https://www.amazon.com/Hoover-Stick-Vac-Filter-S2541/dp/B008MM4UIQ

Here's a post that might help https://homeguides.sfgate.com/diy-reusable-vacuum-cleaner-bags-12000448.html