I have a Eureka Solitaire that sounds like it might fit your needs. I swear that two weeks ago your could get one new for $39.00. Now I see they're going for $89.00. Probably because backpacking season is starting up.

Here's a pic of it with the rainfly rolled up.

But, if your inclined to DIY... Take a look at this Clear Plastic Tarp I made.

Then take a look at these pics of a "Low Tunnel Greenhouse" I made using the same clear plastic and some "Tulle" I got at a craft store:

Pic One
Pic Two

I think that Tulle and some innovative work with tape, poles, and tie-outs would be pretty easy to fashion into something that might work too.

You might also look into a Byer Mosquito Traveller Hammock if you have trees to tie it to. They're still only $39.00. I have one of these too and I like it a lot.

And welcome to the forums!