Inexpensive random orbital polisher?

[apb]

I read the postings and understand that PC 7424 might be the best.
Without too much arguments about "you get what you pay for", what would be an inexpensive polisher that would be safe to use, what should I look for?

It seems that there are plenty of polisher for about $25.
Ebay has some TurtleWax ones. What would be the recommended diameter (I guess 6-8") and I read that foam would be less aggressive.

Again, I do not want to spent $100. If nothing else is safe, I will just continue by hand.

Thanks.