Bought 4 ice climbing scews from ebay this year. Paid $55.00 for all 4. They usually go 50-60 a piece. Screw into the ice with no effort at all, hold like hell and come out at the end of the day with ease. I mounted 4 eye bolts to the corners of the shanty and attach the screws to the eye bolts with a carabiner. The whole kit weighs about 1 lb. Great investment.
Mike