As of this posting, Great Fermentations is taking 15% off used 5 gallon ball lock kegs.  That makes these kegs $59.49 each.  No coupon code is needed.

5 Gallon Used Ball Lock Corny Keg

Check sale or product page for current availability & pricing

Also at Great Fermentations: Tapcooler Counter Pressure Bottle Filler! – Hands on Review

More: Recent Great Deals