1 part lanolin to 4-5 parts 99% isopropyl alcohol
lanolin is a fatty oil from sheep with a consistency similar to vaseline. can be found at most pharmacies somewhere around the feminine care section. (most common application is a kind of ointment for breastfeeding mothers)
put your lanolin and alcohol (I used 91% and it seems to have worked fine, although all the recipes I've seen call for 99%) in a tupperware container and stick it in the microwave for a minute or so, long enough to get it good and hot. mix it well as it cools. put the mixture in a spray bottle and viola. bulk amount of case lube on the cheap.
I haven't actually used it yet, but I will as soon as this current batch of brass gets out of the tumbler. will update with results as soon as I can.