Airing roots?
 

I know you can use packing peanuts at the bottom, but what else is there that can be used??

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Ive been having issues with the medium not drying fast enough

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A small net pot (/udb) vice versa, inside of the pot.

I like to use small over turned net pots (other pots with extra holes poked in also suffice, but not as well - or spare small orchid pots). Or, styro tucked into the center of the root mass.

To take up space in the bottom of pots, I use styro, marbles (fish tank/flower arrangement type), decorative rock, pieces of broken clay pots. I have found the marbles and decorative rocks at the dollar store :D

You can also throw small pieces of styro, chunks of lava rock, leca, into your potting mix.

I was thinking about marbles or lava rock because they are both fairly inexpensive. Pots arent readily availiable here so shipping is killer

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In my cacti pots (who also suffer if over potted) I fill the bottom with quarter sized decorative rocks that you can find at any craft store. I would avoid lava rock because it absorbs water and you want rocks that will not absorb any water, you want it to just let the water drain away.