I struggled with this at the end of 2019 and early into 2020. I ended up testing many of these products:
1. Gardener's brand seedling orchid bark, runs about $9-11 for a 2cuft bag; the local company "Kellogg" owns this brand; no need to sift
2. Forrest Products "soil conditioner", it's a 3cuft green and white bag, runs about $12-14; no need to sift
3. Look up local soil/mulch/compost companies and call to see if they let you purchase by bag or bring your own bag to fill with a shovel. I've got at two near me in OC. One offers both bark fines and hummus, but only certain times of the year.
4. I think EB Stone might have orchid seedling bark as well
5. reptibark - at many pet supply. I ended up not purchasing this, the price is stupid, and the orchid seedling bark is just as good
6. Some feed supply places may carry various barks as well, you'll have to visit, I did not have luck with this
7. Same as #3, except check horse yards to see if there are any small compost companies there and look at their compost product - the one near me does a bark and horse poop mixture which looks like it will work well mixed with perlite/pumice and maybe a little less peat. I plan to try this with some veges next spring. I believe Camarillo should have a lot of stables and isn't too far?
8. Kellogg organic mixes, such as garden soil
If you are trying to find omri or organic, good luck. I got caught up for a couple months searching high and low to find the perfect components in order that my container plants perform at their peak, and my experience has been it doesn't really matter what you purchase as long as you can get it to drain well, which is accomplished by adding perlite/pumice. And you probably won't save money going this route vs. just picking up any of the kellogg bags ("garden soil" is cheapest down here).
One last thing: if you go route of product that has compost or organic matter in it (e.g. kellogg), be prepared for fungus gnats. If they are non-edible plants the imidichloprid based granules are perfect and will stop them. if they are edibles, uhmm... good luck. :p