There was a similar thread a while back. Someone recommended using Silk Drops which supposedly contains the same ingredients. I purchased a 4 oz. bottle at Walgreen's for about $5 or $6. Tried it on a house cue I use for breaking and it works really well. You may want to do a search on this forum.
Or you can go to the Zardoz not wax website and order 100% pure liquid Teflon at $16.95 for a very small bottle plus 10 bucks shipping and have the same thing as original slipstik.--Leonard