Just happen to see Enco has the Phase 2 tool post sets on sale again. Smallest 100 series is for 9-12" swing at $90. If still too large maybe www.littlemachineshop.com still has the mini toolpost sets for the mini lathe.
Actually clicked the link only to find they now carry a QCTP for the Atlas/Craftsman 6".
I have a factory made one for that lathe about 1 1/4" or so sq i can send some pics. Also check out my yahoo south bend group where i machined a sq toolpost right on my lathe and it works great..Bob http://groups.yahoo.com/group/southbend10k/