I've been offered some Winter Leek 'Bleu de Solaise' and would like to grow alongside Autumn Leek 'Jaune de Poitu' for Prettiness :P This is a bit of a long shot, but hope someone might have a few seeds of the Jaune de Poitu they don't need? In exchange I can offer several interesting types of herbs, allium (including Banana Shallot), cucurbits (including watermelon), lettuce, and brassica :)
If all else fails, Real Seeds have them.
Indeed they do SS, and guess who bought some for exactly the same reason ;D ;D ;D PM me your addie and the leek seeds are yours.
Your banana shallots sound interesting, or anything else weird and wonderful!