shoe cabinet diffuser

Please recommend a diffuser for the shoe cabinet.

I spent the summer wearing flip-flops and Crocs.

I think I need to take out my sneakers now.

I opened the shoe cabinet, but I felt an inexplicable sense of unease.

It doesn't smell or have mold, but

For a moment, I wished the shoe cabinet smelled nice.

It reminds me of a diffuser.

What are some good diffusers with good value for money?