Great price on bulk purchase small ziploc seed bags
for packing individual amounts.
I ordered the 2X2 because that is big enough, I think and they were $5.36 per 1000
$16.07 for 3000
$ 5.40 for UPS ground shipping to my zone
That's the best price I have found, and like the convenience of having them delivered to my door, and that amount will likely last a couple of years.
Here is a link that might be useful: International Plastics