I haven't heard of the Pyton 27, but have heard of (from this board) Physan 20 and started using it a couple months ago with good results so far. If that is something of interest to you, here is a link to where I purchased it. If she doesn't ship to Canada, I am sure if you email her she can tell you of somewhere else to get it.
If the link doesn't work then try googling quarter acre orchids. I just noticed the link is different so if there is a problem try the google way.
Products for Happy, Healthy Plants
PM if you have any ?s