DSLR Cameras with flip out monitor screens

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I am looking to get a second hand DSLR and want one wih a flip out monitor screen.

Haven't yet come across one - are there many about?

Did see a a couple of good cameras, inc a Nikon D40x with Sigma 300mm lens for only about £250 but really wanted a flip out viewfinder screen.

I have kids and they just change when they know they are being photographed. Also getting into street scenes and more discreet.

Thanks