So I decided to bite the bullet and give a try from this Medstar company.
I've bought a case of Tena Slip Maxi for about $145 after shipping. So I'm looking at about $2/diaper (I'm paying about $1.93 for Abenas when not on sale)
Looks like they've shipped from the US to Canada for me, but using UPS which could be another $40 for duty and taxes ($1/diaper....). I figured this would be a treat for me to try the Tena's once and for all.
I'd say if you're in the US, it's probably the cheapest way to get the Slip Maxi in medium or large without busting the bank.