Bigpearlsaid . . . Many/most seeds are available online as well as department stores and no need for quarantine.
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If you want to see what your mature tomatoes will look like just buy the biggest, tastiest tomatoes you can find at your favorite market.
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Slice the tomato in thin slices and plant the slice 1/4" in the soil. Within a week or so several plants will germinate from each slice. When the plants are about six inches tall, choose the healthiest looking plant from each slice and cut the stems off the remaining plants.
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Also when you prune your growing plants, the pruned plant stems can be placed in water and they will sprout roots. Then you can plant these in your garden. It's possible to grow dozens of tomato plants from the original plant or slice.
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Tomato seeds are not digestible which brings me up to the subject of Milorganite. Milorganite is the fertilizer that is the byproduct of sewage treatment from the Milwaukee Metro Sewage Dept.
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From time to time undigested tomato seeds that have been through human consumption and then processed by the Milwaukee Sewage Department grow into healthy plants (wild) when the Milorganite Fertilizer is used.