Wood (50)
Copper Ingot (20)
Coal (30)

Stone (30)
Iron Bar (20)
Rope (15)

Gold Bar (20)
Quartz Panel (5)
Silk Rope (15)

Solar Panel (5)
Ball of Sun (5)
Golden Rope (3)

I might update this guide with some screenshots if people wish for it. Leave a comment if you want that. Also, rate the guide if it is helpful.

Zenith's Amulet - Only one Available - Requires 3 Golden Goose Eggs.

Zulufruit Seed - Three Available - Requires 10 Arcane Shards each.

Zorpian Tree Sappling - Only one Available - Requires 10 Rubies.

Suspended Baby Blue Chicken - 999+ Available - Requires 10 Maple Syrups each.

Zenticules Placemat - Only one Available - Requires 2 Jades.

Zulu Plushie - Only one Available - Requires 5 Ether Crystals.

Zee Plushie - Only one Available - Requires 5 Pink Honey.

Zenith Plushie - Only one Available - Requires 20 Iron Bars.

Zephyr Plushie - Only one Available - Requires 50 Gold Bars.

Zulufruit-in-a-pot - Three Available - Requires 3 Lucine each.

Personally, I would buy at least one of each thing, but I'm a Completionist myself.

Zenith's Amulet is a powerful amulet that gives 160 points of health. At one point on the VR Game, I actually decided to use it since the damage done by enemies was... too much. So it helped surviving so my pet and drones finish the job for me. I highly recommend getting this one.

Zulufruit Seed allows for growing a plant that will give a nicely priced produce.It's required for both Hersha's Shop Food Display, and the Museum. I highly recommend getting at least one, since you can use the Seed Maker later to make more, as long as you got one of the fruit. I also recommend planting on the Greenhouse, for obvious reasons: It's an 860 Value produce you can get year round on the greenhouse.

Zorpian Tree Sappling allows to grow the Zorpian Tree that will produce Zorpian Fruit all year round. It's required for both Hersha's Shop Food Display, and the Museum. I highly recommend getting this one, as it is an unique item.

The Suspended Baby Blue Chicken is highly optional. You won't know which food it wants before trading, and it will do everything a normal chicken does, expect it's blue.

The Zenticules Placemat is an unique item for cosmetic purposes. I believe it is not required at all, for anything, and can be skipped.

The Plushies are obviously required for an Achivement, and that's it. If you're not going for it, you can skip them.

The Zulufruit-in-a-pot produces a Zulufruit each 21 days. Can be used for making more seeds, or just to have the fruit available at any time. The high amount of time required to bear fruit makes it highly optional.