Apex has surplus K-31 cleaning kits on sale right now for $8.95. I thought it was worth rolling the dice on to see if the kits still had some grease in them. I ordered three kits which should come with six tubes of grease. I'll report back once they get here and let ya'll know if it was worth it.
Swiss K-31 Cleaning Kits
Swiss K-31 Cleaning Kits