you got have them somewhere. First try craigslist. Then look for nurserys. I can get a bag at armstrong nursery out here in ca for 8 bucks. Dont worry about the net. I order form them all the time. Besides man if you really cant then go ahead anyway, It is onyl worm castings and that is so far form illegal. you have no idea how many poeple have reg gardens. I myself have a reg garden I started as cover, which worked, and am now neck deep in herbs and vegatbales that all smell good! Anyway, just do it. Get a 30 dollar bag if yu do. Dont waste your time with the 10 dollar eBay stuff. That is a ziplock! Seriously google a nursery. Earth worm castings ewc. Or yu dould make yer own, it will take a while tho to get set up. Months.
Also I bet that the bone would get eaten. If yu really dont want ewc go get some compost. Like any store. Get a 5 gallon bucket. Throw in a quarter of the bucket with compost. Fill 3 gallons of water. Put 3 tbsp of molasses. Put an airtube in their. The bigger the better. Get the biggest airpump you can find or a bunch of smaller ones. Let it go untill you see some bubbles. After this, 12-30 hours our off all that liquid into another bucket. Throw in your bonemeal. Add your airlines. Let it go for 12-30 hours. You should get it ate up if they eat it up at all in a tea. I have no idea if they eat Bonemeal in a tea or how that works. I am curious now.