ive actually had very good results from ebay.
i got papaya seeds from like 4 different sources.
i order from ebay a lot, and normally as long as the seller has a good rating,
i go for it.
papaya seeds last a long time when dry, they just take longer to germinate
unless they are very frresh.
The only time i had a bad experience with seeds, si getting recalcitrant seed
from a seller who had 100 different varieties, and all for $1.
i had ordered 15 varieties, and 3 types didnt germinate
which i had kind of planned on anyway.
i get papaya seeds from University of Hawaii
$1 (about 40 seeds)
Agricultural Diagnostic Service Center - Seed Program
Waimanalo X-77 variety. disease resistant, always healthy plants.
low-bearing - short plant, but normal size fruit.