Our garden community is so generous, you may find other things besides seed being given away for Free in The Great Exchange.  Just cover shipping and handling.  While the exact amount you will receive is up to the donor,  you can expect to receive the minimum per category listed below:

10 Small seeds
5 Large seeds
4 Small Bulbs
2 Medium Bulbs
1 Large Bulb, Tuber, or Rhizome
2 Scions
1 Cutting with at least 2 nodes