Yes, they do exist; not sure where, but they are out there; sorry I can't be more helpful than that. Here's why though:
I doubt that many people here will recommend it. The P4 relies on fast memory to do its best work. Coupling it with PC133 really hits the P4's performance bottleneck where it hurts. A DDR board will offer more performance, and shouldn't cost much more.
And of course, many people will probably recommend an AMD system because of their good performance and low cost.
