Filter Alternatives

We're new to keeping betta and our filters are AquaOne 55C.
I'm staggered that these filters cost about £5 each and am respectfully asking whether anyone can advise if there are any cheaper alternatives available please ? Links would be a nice bonus - thank you in advance.

55c? I'm getting images of reusable filter pads. I assume you want to stop buying them as replacements?
They are simply products made by the company as a way to have a constant income stream usually at the cost of newer hobbyists. If you want to take advantage of filter floss just buying a bag would be much cheaper.
This bag cost me £5.45 last year and I still have half left. JBL Symec

IME just a piece of coarse sponge would do, in both a HOB filter and internal filter. Just rinse every week or two in tank water during water changes.

Hopefully this helps

Like Matt, I use sponges and floss. Works great and very economical.