For what it's worth Buildasofa.com in the US seems to be making custom more affordable. I can't speak to the quality as I haven't ordered anything, but several

For what it's worth Buildasofa.com in the US seems to be making custom more affordable. I can't speak to the quality as I haven't ordered anything, but several friends speak highly of them and I believe their prices are far below the $5k number being thrown around.