A.F.
If you don't need the cash, you can take them to the Goodwill, get a tax receipt and you put the value of them and write them off as a Donation on your taxes. Thats what I do! A couple of consignments stores I know of are:
1)Children Orhcard, which I assume is who you have already tried (appointment only). Buth their are also locations in Huntington Beach, Lake Forest, Cypress.
2)Precious Repeats
11446 East South Street, Cerritos, CA 90703
phone: ###-###-####
3)Belinda Gayton - Retail Sales & Merchandise
9252 Cerritos Ave, Anaheim, CA 92804
phone: ###-###-####
fax: ###-###-####
email: gaytangmail.com
4)Wearagains For Kids
15061 Edwards St, Huntington Beach, CA 92647
###-###-####
Hope it helps!!