I just made the reservations for my brother to hand-carry about 10,000 seeds up from Mexico on July 9. We're putting them online now because we like to sell them while they're as fresh as possible, but we won't be able to ship before Thursday, July 10. They're obviously "first-come, first-serve" and we don't expect to get any more this summer.
For people who aren't necessarily good with seeds, check out the seedling special. Buy two seedlings are the regular price, and we'll send a pack of seeds for free.
If you're not familiar with the challenges of growing neem trees from seeds, they're only viable for about 30 days after they are harvested. Cold winters in Florida have forced us to buy seeds from international sources, and we've decided that the best way to get good germination is to hand-carry them back from Mexico. (India doesn't allow the export of fresh neem seeds.) Even so, they're notoriously difficult to germinate and we can't guarantee them. Sometimes they just don't come up, even for customers who are very good gardeners and follow directions perfectly. We don't know why and therefore can't make recommendations.