I've heard that the early registration bibs up for grabs only make up 5-10% of the total bibs available for each race. With the 5K and 10K, 7,000+ of the available bibs are taken up by Dopey runners.
Assuming 12,000 runners in both the 5K and 10K, and 7,000 bibs already allocated to Dopey runners...that's 5,000 5K- and 10K-specific bibs left. So if it's true that 5-10% were available today, you were competing with every other AP holder/DVC member out there for 1 of 250-500 bibs. It'll be much easier to get in next week.