Ok. I'm gonna do an experiment and manifest $20. My general intention will be to find a 20-dollar bill on the ground/street/etc., but I will not close it to just that. It would be fun if I found it just laying on the ground. Because it seems unlikely that it would have been there very long, bills can get blown by the wind, etc. I know it can happen because I did find a twenty once before, just laying on the sidewalk with no one around.
Oh, I think I've found many silver coins before on the ground, can't remember the most I've found. But I've also had dreams where I kept finding silver dollars, quarters and dimes and it was a lot of coins!