you can get a 5500k generator at HF for 600$
http://www.harborfreight.com/cpi/cta...emnumber=94191
or a 6800k at kragen for 600$
http://www.partsamerica.com/ProductD...goryCode=3483C
i dont know what costco has. but, for the amount of time i would actually use it, cheapo is bueno.