I got a Hundred pager now also. Chiang Mai Consul. Took about an hour.

Yes, you can get two sets of extra pages added, but ask to be sure.

On the off chance a particular embassy/consulate starts to run low, though, I'd do this now, not wait until the end of December. Note too that in Thailand you have to make an online appointment first, and appointment slots are limited. (In some other places, like Hong Kong, you can mail your passport in, so you're not rationed by the appointment system.)

Thanks for the responses, everybody. I'm actually in the US now. I just sent the passport in with a request to add 48 pages. From what I've read, they're selective on whether they fill the request or not. Sometimes they'll just add 24 even if you state you want 48 pages added. Same price for both. Anyway, I gave it a shot. We'll see in a few weeks.