ok, did not see your requirement for outside boil until after I posted.
on my list for Santa is a turkey fryer
(also wally world) for $50
with the 30-quart kettle, it would be just as easy to do full all-grain with full boil
"Beer. Good." - Words of House Grog
drinking: Otto M. Gourd Pumpkin Barleywine, Jewel Thieves Apple Wine, Fresh Squee Zed IPA - bottle conditioning: LoCo Foot Barleywine, Basque cider - lagering : Schwarzbier - fermenting: apple wine, Skeeter Pee - on deck: Grodziskie