Here are some more sources. I'll let you google!

Mountain Laurel Designs

Gossamer Gear (these won't be available until the spinnaker fabric shortage is over)

Antigravity Gear

Oware

I found that by the time you add together the weights of tarp, groundsheet and bug netting that you pretty much equal the weight of many of the lighter tarptents on the market. I personally prefer having a fully-enclosed bug-free shelter. Your Mileage May Vary! Sources for these tarptents include Tarptent, Six Moon Designs, AntiGravity Gear and Gossamer Gear (the last is again having problems with the spinnaker fabric shortage).
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey