Well 2000 zen costs $20USD. You spent $20CAD which is only $18USD..... Not sure what you're complaining about, you still owe $2USD if you want then zen.
Here's the gambling method - convert any Z to AD and buy the blue profession packs off the AH. They contain bonus alchemy assets right now so it's worth it IMO. Sell/trade whatever you get for the assets you want. I bought an ultimate game card from walgreens for $20 and it gives a 300Z bonus. That 2300Z then sold on the…