I paid for my sleeping pad, it was only 10USD at a military surplus store.
Cardboard is free and nearly everywhere. It is clean and has a
smell that puts me to sleep every time and dream good dreams.
Cardboard is magical, never forget. Blankets are easy to find cheap
or free even. As important as bedding is, I can gather what I need in about
10-15 minutes in virtually any city. It is far down on the list of things I
concern myself with, you can probably sweat these items less as well.
Where to sleep is often more difficult for me than what to sleep on.