I love the Diamond Stitch too and have been looking for one as well. I contacted Chanel consumer line and they didnt have any in the styles I was looking for. Maybe NM or Nordies would. I guess you just have to get lucky!
I have the brown tote from the Outdoor line which is very similar. I prefer the smaller cc logo and muted antique hardware. The Outdoor tote only comes in one size but it is plenty big enough for my needs.