Is it? It's been a while I looked at the VF site. I have accounts with VF and 2D since I have phones with such frequencies. I was surfng around VF's Prepay webpage and it didn't list Prepay Smart's standard pricing plans, I had to logon and see my profile (49c/min). They did list Supa Prepay and its 89c/min calling rate but it was not listed after you click Prepay from the homepage you had to click Prepay Smart "bundles" and then it listed Supa Prepay.
It seems also that Vodafone prepay only have $19 plans. Telecom at least has a $9 monthly plan and their $19 and $29 ones.
Low users seems more received with 2D and Skinny. Ie 2D's $8 chat pack and their standard $19 combo's and Skinny's $16 combo, text packs and their weekly plans. It makes sense that if you are going to make a phonecall for a few minutes to order a $4/week pack just before you dial out ... :D