My recollection is that Rockauto had the rubber brake lines for my 1971 142 and probably had the best price.

I ended up going with braided stainless steel. They were custom made by a local hydraulic specialist shop using the originals as templates. The price was relatively low, around $150 Cdn for the four front lines and two lines to the rear axle.

I don't know that the braided lines will be materially better than the plain jane rubber lines performance wise. They won't suffer from the eventual swelling that seemed to plague some of the Volvo lines (probably not an issue with modern replacements). If you have alloy wheels with large open areas in the wheel disc, the braided lines do impart a lttle bling factor.