Look at the Huntec 2 man bivvy as there a solid wee unit... had mine in the Kaimanawas to Fiordland tops in some seriously shitty rain / lightning / thunder storms and stayed fine.
Another option is a siltarp 2 or 3 man fly, Ex US Army goretex bivy bag and a exped inflatable mattress.
If money is a real issue then grab a blue plastic tarp from the warehouse for a couple of dollars.
I've slept under the stars a few times but it's nice to have that added security of something overhead incase the weather turns during the night.
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