Cheap filters for all tank sizes?

Any size; sponge filters

Internal filter; Less than 35 gallons

HOB; Aquaclear, Aqueon, stay away from Tetra/Aqua Culture

Canister; Eheim, Top Fin, Marineland, SunSun

Like Brosj said, really sponge filters work for any tank size.

For smaller tanks, many just use a sponge filter or a smaller hang on the back. Some brands include Aqueon, Aquaclear, Fluval, Eheim (used to have smaller filters).

For medium tanks, mostly recommend hang on the back or canister filters. Some brands include Aqueon, Top Fin (for canister filter), Eheim, Aquaclear, SunSun, Marineland.

For big tanks, mostly recommend canister filters or sumps. Some brands include Eheim, SunSun, Marineland, Fluval, Penn-Plax, API.