I make my own, super cheap and works well
2 parts mashed potatoes- just poke holes in em, stick em in a microwave, put them in a bag and mash them with your hands. (or instant potatoes, but my family doe not eat those so I use whole potatoes.)
1 part banana- cut it up, stick it in the same bag, and continue mushing
.5-1 part water- warm or boiling, whatever is perfered. (I've done both and have not seen any obvious differences)
A pinch of cinnamon
A pinch of sugar
Then continue mashing in the bag, stick in cultures, and, if you really wanna go cheap, cut up paper coffee filters work just as well as excelsior.
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