Ditch the cot, get a good insulated pad (unless you have really bad knees or are over 60). Or get a thermarest $250 lightweight low to the ground cot haha.
Rei garage sales for sure! I work for them and get better deals at the garage sales.
Seed house 2, long wide BA pad, always wake up with a smile, hard to leave the sack in the a.m.
They also make single wall tents although they're usually 4 season tents and not as breathable in warmer weather. Nemo makes some good ones, some with inflatable pole systems that you can set up from the inside in bad conditions but that's getting off topic...
A cot with a tarp is always an option too