Easy Roam is OK for a brief visit accross the border, but the fee ($12 per day, that has increased 50% very quickly) is way too much for a longer trip (potentially up to $360 + tax for 30 days!)
Have the alternatives disappeared. Recently I went to the US with an unlimited 30 day Telus plan at under $100. Searching on the Telus site they seem to have no alternatives now. I tried to phone them and gave up after a 1 hour wait.
I suppose there will be no response from Telus here since they don't seem to monitor the forum and and if there are any answers from members I don't see any.
Often it is simpler for long stays (eg. Snowbirds) to get a US plan, and change your VM to direct callers to your US number. Since incoming SMS are free, you can reply from your local number, explaining to those you respond to the situation.
If you are a frequent traveller across the border, a Canada - US plan may make sense.