As the topic says, please suggest where can I buy these two parts with decent price? I am more interested to find the proportioning valve due to its rareness (an odd part?)...

I am replacing my 1992 Dakota LE's (5.2L 4x4) brake proportioning valve because it's leaking and causing "Anti Lock" and "brake" lights come up. Replacing the master cylinder is an add-on for this mini project.

 

For the master cylinder I would sugest napa. Autozone or checkers or pepboys are all can have cheep quailty parts. That is something you dont want to fail. I had 2 autozone master cylinders fail on me with in a year. I went and got napa. No problems since. For the prortiong valve I would suggest a dealer. There are a few you can order online like. https://www.dodgeparts.com/oe_parts_catalog.html or
http://www.moparpartsamerica.com/par...?siteid=214583

I had mine get cloged up due to the failed autozone master cylinder. I just went out the junkyard. I got mine from a perfectly clean dak. for $10. Now I got good brakes again.