Coconut oil (Allies recommendation)
+cheap & available (supermarket, organic store)
+anonymous (“I use it for cooking!”)
+relatively long lasting
+It will have little effect on your silicone toys.
-unproven negative effects on silicone toys, that seem to be rumours.
Water based lubricants
+definitely safe to use with silicone toys
+cheaper than oil based lubricants
-big minus: lasts not long enough for a good mindgasm session <1h
+very long lasting and efficient
-likely to damage your silicone toys