Closed External or Internal SD/FF (Wanted)

I am looking for a Scandoubler / Flickerfixer.

If its an external, good as i can use it on all my Amiga's.

If it is internal, then i guess i can only use it on specified models.

Don't really want to spend much money, not unless its for an Indivision AGA.

Cheers

Still interested in finding one but i am on a budget so no fancy prices. I'll be honest here but im not looking to spend more than 50-60 euros.