If the dosing is super accurate, $20 is a great price. Honestly, price matters less here than precision, especially since a lot of the users will likely be women and dosing tolerance is much tighter.
MIG812 is obviously considered the gold standard, no debate there, but MCT works perfectly fine too, so definitely no need to throw it out. You are doing a test batch anyway, so keeping MCT in the mix makes total sense.
As for TNE, $30 sounds fair to me as long as quality and consistency are on point. Time is money after all.