3.41s still available at Newegg
I know that in the short future, it's not going to make any difference, and 3.42/3.5s can be downgraded, but thought I'd mention that I just received the Black Friday bundle from Newegg with 3.41 still on it. Here is the link Newegg.com - Suggested Products. I've seen it go in and out of stock over the past few days, but it still shows in stock now.
Just posting in case someone finds it useful (ie doesn't want to wait for 3.55 jailbreaks or deal with downgrading, or whatever reason).
Personally I'm glad I got it because now I can feel safe upgrading my other console to 3.55 for my PSN access and will use use this new system as my offline one.