Re: is there any websites....
Not anything worthwhile.
Most places sell 50 gram packs for this purpose. They're usually about $3 and should give you a good 1-5 bowls (Depending on the size of your bowl.)
Other than that, hang around on the forum, make some friends, and show yourself to be a worthwhile contributor around here, and after a time, some members may be willing to trade or send you samples.