Yes GP--La Tierra Farms.
For both.
We've ordered pecans from them. They are expensive. But yummy.
I would be happy to send you some, but I would worry that we cross contaminated them while cooking.
If I had to choose, I'd go with pecans first. DS is not allergic to either, but we added pecans first, and wow--it's been great. It's not like it's mattered in terms of items made outside our house, in terms of pecans or walnuts. He only eats pecans or walnuts coming from our house. But with pecans, you've got pecan pie, banana muffins, all kinds of things.
Of course, I'm from the south, where pecans are more plentiful.
I would call La Tierra about XC with other nuts. I haven't yet. But DS is not allergic to any tree nuts, and we've been testing/eating them one by one for years.
It's exciting! I'm glad your DD is in this position!