David,
Funny you replied. I started to post to help you, and realized I don't have an item number for those kid grids, which is really where you need to begin. After being through the mill with Target and their distributors about the grids myself (I'm always buying them out of the regular white grids), I've realized the only way to get through with Target is like so:
Call a Target store and press 0 immediately. Ask for "Guest Services." When you get someone there, ask them to do a "merchandise locate" for all Target stores within, say, 50 miles of your zip code. The will be able to punch the item number into the computer and let you know how many of the grids they have in stock at any of the Target stores within that radius. (This is where the item number would come in handy, of course.)
Problem is: Target's website doesn't list the item (at least I can't find it) and I believe those kid grids are exclusive to Target.
Now, I did see 3 cases of the the kid grids (I think there's 13 grids in a pack of 4 colors) at my local Target. I wish I wrote down the item number at that time, so I could help. I'm sure that someone posting here must have them and can give you the item number. Once you get that number, call Guest Services to find out what Target in your area you can get them at.
If all else fails: I'll get you the ones at my local Target and send them to you! I frequent Target every few months to stock up on grids, and there are several in my area.
I know there was a great thread a while back on the kids grids. I just can't find it. Good luck. I'll keep an eye out for you and let you know.