Another frugal Idea:
I grew up with putting baking soda in the fridge to combat odors and while it is cheap, I have also heard that you can put lump charcoal in the fridge and it will do the same thing, but cost a lot less.
Worth a try anyway.
Frugal Idea: Fridge Deodorizer
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Update: I realized the validity to this idea when I had the epiphany that commercial odor removers use a charcoal canister to remove odors. At work we use air recyclers to remove nasty fumes from chemicals and do this by filtering through air filters and a large charcoal media filter.