Options for fully lined bulk cable housing I perform maintenance on 3 personal bikes, and often friend's bikes (a few per year, usually).  One of the most common tasks is replacing shift/brake cables and housing.  I live in Boston, winter is brutal, and the bikes I maintain are used in terrible conditions as a means of transportation, so they must be reliable. 

I'm interested in finding the cheapest, most effective way to have bulk housing that is fully lined or sealed.  It would be incredible if there was a type of housing that could be bought for cheap enough that could be used for both brake AND shifting, such as Jagwire's 5mm compressionless brake housing.  Right now I just use cheap bulk/shifting cable rolls, unlined, and I'm tired of having to replace the cables so much.

Any suggestions welcome!

EDIT:

Jagwire and some other companies make a 5mm compressionless brake housing.  Since it's compressionless, but strong, I was sort of hoping that there was a cheap alternative, and that it would work with both brake and shifter cables, even if the shifter cables have an internal extra 1mm to move around.

It seems that the best way to weatherproof the system is to just use full length housing.  I have seen cable setups before where the cable in between the housing stops has a liner as well, implying that the housing inner liner is separate and meant to be run through the housing like the cable.  I was basically wondering how those work, and if you can get that setup in bulk, but they seem to be pretty complicated and have a bunch of different cable housing ends for different.

I think I will buy some bulk lined cables to do full length housing runs.  I may try getting some jagwire 5mm compressionless brake housing and try to use it with shifters, and will report back with results.  

Thanks for all the input!
You can buy 30 meter rolls of cable housing such as http://www.wiggle.co.uk/transfil-gear-casing-30m-box/ . I would opt for Shimano or Transfil, as have seen problems with the much cheaper Clarkes.

Brake  cable housings  have a completely different construction to shifters. The housing is a coiled sheath , compared to the axial strands in shifter housing. And brake housing is larger diameter. So different housing for different purposes.