In my semi-weekly search of Craigslist, I found a week old listing for a 128. The lister says it has a 256 KB RAM upgrade (which makes it still less than a 512, but more usable than a stock 128,) and comes with keyboard, mouse, and numeric keypad. And it's a steal, price-wise. (Although it will become the most expensive system in my collection; dwarfing the $100 I paid for a Duo 2300c. It's even more than the $200 I paid for a Newton a few years ago; which I bought to actually use daily, not as a 'collection piece', but which is now relegated to 'collection' status.) I was amazed to find out it was still available!

I should pick it up sometime next week.