Updated 11/14/2019:
Tired of spending lots on postage for individual trades of a few seeds here and there?

NGA has a seed swap next month (trading begins Dec. 5).
If you have extra seeds that aren't too old, and would like to trade them for seeds you don't have, click on "tools", and then on "seed swaps". There's room 48 more members in December's swap.
I believe you have to sign up to see what is being offered, but under "My Profile" you can click on "Leave this swap" and remove yourself easily, if you wish.

The cost is what you spend on mailing your seeds in to the host, and $8 for return postage, for seeds offered by over 30 or 40 people, with the ones who are already signed up.

Be prepared to spend some time listing, (re-)packaging and labeling your seed offers. You don't always get exactly what you are looking for - but sometimes you get far more. I am growing things now that I never heard of before!

Need more seeds to get more dibs in the Dec. 5 Seed Swap ? I'm offering 35 + pkts. of seeds already labeled with name, date collected & amount that I offered on 'Commercial and Group Buys' last week because I won't be able to participate in either the Nov. or Dec. one this year. They must go & will be randomly picked as an asst. of Flowers, Herbs & Veggies & great for the Seed Swap in Dec. All are viable being collected 2018 or 2019. Postage will cost $5 for a 7"x 9" bubble pkg. full. Postage can be sent thru Paypal or a money order. Send your address ASAP so they go out next week. Trudy