No...johanni with electric yellow
cobalt blues are far too aggressive
Google is your friend. Use it. Google Texas Holey Rock. take some initiative and you will be rewarded.
I wouldn't use rocks found outside as you don't know what they've been exposed to. They could be covered with petroleum residue, pesticides, etc.
Try eBay.
Yah, I see what you mean. I forgot to check the shipping. Someone in Canada will have to make alternative suggestions for you.