Unless it is an old, old plan, picture texts should be included in the base price of the plan, as long as you have data. See http://www.telus.com/en/bc/mobility/?INTCMP=TcomHomeTile_MOB_Phones and click on "your Choice Includes" in the Your Choice Plans section.
Were you charged, or were the texts simply listed in your statement?
Are you in southern Vancouver Island where you might be picking up a U.S. cellular signal? 30 cents seems to be consistent with the pay per use charge for sending an MMS while roaming.
I would note the network indicator over the next little while to see if it actually does toggle over to roaming network.