Hi there Linda,
Welcome to planDisney and thanks so much for your question!
I noticed the same thing when I went to see if I could purchase the
Anaheim Resident Ticket Offer - there is a notice on the ticket purchase screen that says "The offer you selected is not available. Select an option below or explore other offers."
When I've seen this in the past with other special offers, the tickets have stopped being offered for sale when all of the available park reservations for those tickets are booked up. It's possible that is what is happening with this promotional offer as well since there are only a few more days to use these particular tickets. If you're curious to explore it more then you can call a Cast Member at +1-(888) 478-1098 to discuss more details.
Beyond that, you can continue to keep an eye on the
Offers & Discounts page to watch for new offers that you might be eligible for or
purchase a 1-day park ticket on a lower tier day. For example, it looks like the first couple of weeks of November have lower tier ticket options available, which you can see on the purchase screen when selecting the date for your 1-day ticket visit.
Thanks again for stopping by with your question, Linda! I hope you have a wonderful time planning your next Disneyland Resort visit.
Have a Magical Day,
Greg