Propagator Help/Recommendation !

Hi iv got a friend (lol) who's just bought some Critical Mass seeds and wants to ask some advice for a good propagator to get and the setup etc !

Will any old thing do as long as you've got a proper environment to put the box in ?
Any recommendations/help ?

Cheers

you can get a humidity dome from your local garden supply store, hydro store, home depot, etc.

You could also just use some tupperware.... Just need something clear that will keep it humid.