Try this link, as this is the cheapest that I have found for them. Holland & Barrett do a tablet form, but they range from £11.00.
You can have sweetner if you want, but in tablet form and not powder. My advice would be to stir it in with the water to dissolve before you add the shake and the husks.
I haven't made any yet, as my husks are on order, but I can't wait!!!
1. Try getting them from GNC, mine had them in stock.
2. I use half a vanilla pack and 200ml of hot water and 2 tea spoons of husks. It's yummy in the morning and you you got half a pack spare to use during the day. I find that the vanilla is sweet enough so no extra sweetners required.