A local shop gave me just over 1/2 a 5 gallon bucket of COWW and all it cost me was the installation of four new shocks, upper and lower ball joints, and a wheel alignment. They must have felt sorry for me after two visits in one week.
My last wheel weight find of about 60lbs cost me two full sets of tires! All I asked for was my eight wheel weights back and they gave me a box of them. One tire shop I checked on was saving them as an investment thinking the value would go up along with gold and silver. Other tire shops were "under contract" with the scrap dealers.
If they are doing service for you, it doesn't hurt to ask just don't get greedy or too desparate.
I also will be making a purchase of linotype soon from someone who has more than I can afford to buy at any one time at $0.75 lb. So far my budget has allowed for about 150 lbs of linotype slugs.