It could be that people aren't interested in donating. It also could be the 3hrs you gave it. But, in all honesty, you can probably head down to your local creek and find some. If not, you could head to San Marcos and River City Park and grab some local flora.
All else fails, give it a little more time, someone is likely to have some : )
I think that's what it is - I am not positive, that's why I posted a picture. To try and see ^_^'
If it is the plant you want, I could probably spare a strip of it. Mine's still relatively new so not a lot of it, but it's growing really well so it wouldn't hurt me to take a small loss of it. If you are interested I could talk to my boyfriend about meeting up with you If you have any plants to trade, that could work too, I only have the Hydrocotyl, a Crypt Parva, and my Marimo.
Also, if you want more then that, Aquatek will sell it to you from the planted tank right in front of their entranceway.