You don't say where your located.
I picked up a very nice Ensign Selfix 820 for £35 ($54) earlier this year which has an excellent coated Ross Xpres lens, it's not a rangefinfer camer though but can shoot 6x9 or 6x6. On Sunday I found a very nice Zeiss Ikon Nettar (6x6) for £5 ($8).
There's plenty of good old post WWII 120 folding cameras around many with excellent coated lenses. I've picked up spare lenses and shutters on my travels often for £2-£5, thre shutters are unused