Hello Boomer
I live in the UK and I buy my Kendall Lille Supreme fit Medium Maxi in a box of 4 packs from Allanda. They are brilliant to deal with and the nappies arrive the following day by courier. Now I don't know where you live, but if you live in the UK have a look at their website:
http://www.allaboutincontinence.co.uk/home/default.php
Why not contact them explain your situation and see if they can send you some samples. I have a colostomy and I find that ostomy suppliers are very keen to send me samples.
If you live in the US, why not Google Kendall Lille and see where you can obtain them?
Just before I go, my waist size is 33 inches and a medium fits me perfectly. That may give you something to compare with.
Wishing you the best of luck.
Richard