Haha. Well when we get to the potting mix we can talk about pine bark fines, chicken grit (Manna Pro crushed granite - not oyster shells), oil absorbent material (Diatomaceous earth - NAPA Part Number: NFD 8822) and cat litter (Walmart - Special Kitty only!)
Among other things. Many things other than perlite serve the same purpose. I stay away though from vermiculite except for storing bulbs and tubers.
I try to load up on things when the price is lower and/or on sale - even though I may not need it at that moment, most things last a long time. I still have a bag of pine bark fines and just ordered 6 more bags for next spring.
Right now though, all you need is some seed starter media and perlite.
BTW - when you get to potting soil stage - do NOT buy anything that is water retentive or similar.
good luck Mary - there are lots of helpful people here with lots of great knowledge.
