You can find monorail cams for as little as $75-$100, then you will need a lens , sturdy tripod(Tiltall's go for $100 new), focus cloth, film holders, loupe, etc. 8x10 and larger will start at least three time more than 4x5,but you can contact print the larger sizes and won't need an enlarger. You don't need an enlarger for 4x5, but who wants to look at post cards for prints, I like my prints a bit larger. Field cameras, or folders, are far and away more expensive than monorails, but lighter in weight, have fewer movements(a must have for architecture). Just a few things to think about as you venture into the wonderful world of LF.