The 642s have been available without a lock since 2008. I bought one that year and have had it since.
The 442s without the lock became available sometime after that. I picked one up a few months ago.
Bud's usually has them , but is currently sold out. Here is a link to their listing:
Seriously, if I couldn't get a no-lock 642, I'd buy something else before I got the one with that ugly lock. Maybe something like this because it gets good reviews: