In most cases just a few seeds are all I need.
looking for these specific varieties
Have lots to trade
cucumber: Asian Nectar, Speedway, Tanja, Saber, Corinta, Cross Country, Iznik
eggplant: (commerical only) Purple Rain, Twinkle, Diamond, Neon, Millionaire, Antigua, Fengyuan Purple, Machiaw Hybrid, Bride Hybrid, Hansel, Long Slim Purple, Dairyu, Zebra, Orient Express, Orient Charm, Bride, Ichiban
Leek: starts
Lettuce: Dazzle
lima bean: Eastland
Pepper: Karma, Sweet Sunrise, Snapper, Bendigo, Mango, Orion, Redstart, Intrepid
shallot starts
spinach: Renegade, Melody, Space Hybrid, Wolter, Fiorana F1 Hybrid, Regal Hybrid, Dolce Vita, charger, Pigeon
Tomato: Polbig, Valley Girl, Sakura, Sunpeach, Oregon Spring
zucchini: Born Free, Lolita, Sungreen, Cashflow, Sable Beauty, Midnight F1 Hybrid, Venus F1 Hybrid, Defender F1, Tristan F1 Hybrid, Wildcat, Noeche, Dunja, Reward

Here is a link that might be useful: My Trade Page