I found a Galoob (?) Slave 1 on the ebay some years ago:


I am not sure about the scale, but the Boba Fett pilot that comes with it is exactly the same height as the Grenadier/WEG Rebel Trooper in the pics. So one might assume the ship too is the same scale? Rather pathetic little detail is the Han Solo frozen in carbonite: the box opens, and inside you find Han Solo himself... the hours just fly playing with these!

Of course, this is toy quality, so the hinges of the cockpit are rather robust, and the paint work is typical prepaint standard, but I haven't got around repainting it myself.
There must be some scale models of Slave 1 but I have no idea if they're suitable scale? Oh, and someone mentioned the Revell easy kit Millenium Falcon: it is indeed somewhere around 1/72 to 1/100 in scale. A bit too small, but works fine as game prop, it's almost big enough for 25mm. For 28mm it's not so good, I would guess.