Remember with a bridge hammock, your tarp needs to cover the spreader bars or you run the risk of getting wet. So if you go with a hex shaped tarp, factor that in. The large Hennessey Hammocks hex tarp in polyurethane coated is $70 US but weighs 23 oz.
I don't think you're going to find what you are looking for in a new tarp. Check the for sale section, for a used large/winter silnylon tarp (Super Fly, JRB 11x10, etc) that will get you the weight and cost fact you are after.
Cheers
Brian
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