Jessica,
rather than recreate the post, there is a recent
series on this. I would gladly share some cuttings, but I suspect you could literally get most stuff in your own town. Concentrate on the network. There is likely a
local gardening club, I have gotten some great stuff from people in one here. And I am now sharing with others. Maybe
facebook (I am totally ignorant about it). No postage required and more likely to be suited for the various aspects of your climate, not just USDA zone! This is a good time to be asking for spoiled veggies. I haven't "planted" winter squash in two years because I throw them in the
compost in the fall and then they pop up where they are suited. I don't store the seeds anywhere but in the compost. My most productive tomatoes were the same. I have no idea where the cucumbers will be next year.
Some stuff I am trying to "improve" (ah the hubris) I am growing from dry seed, but much of the "garden" is just a kaleidoscope of free seeds from last year, self selecting for me.