Unless you are dying for some San Fran flavored tangy sourdough or some other very specific flavor profile definitely go for making your own! It's really as easy as feeding your baby. There is wild yeast (and bacteria and fungi and...and...) everywhere and if you give it a few days you'll have a new little baby ready for gifting you with daily/weekly bread! I 2nd the note above about the Sourdough Project's recipe. I've used it twice after killing off a neglected batch in my fridge in a newborn haze and it's worked like a charm! In fact I have a bowl of dough fermenting on the counter right now for tomorrow.