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If you can't find them at your local big box stores, I would recommend going to some of your local smaller nurseries (such as Valley Garden Center or Waugh's Nursery Center). They should carry them or be able to tell you who in the area does. It may also be a matter of timing. Most places do not carry the same selection of plants year round. They will carry what is popular at that time of year. It is easiest to find wisteria when wisteria is in bloom, because it is on people's minds. If you can't find it locally yet, wait until it blooms in your area and check the stores again.

If all else fails, there are many reputable online sellers who will ship to your home.

To be very honest, wisteria from seeds is not a great option. Wisteria grown from seed can take decades to reach the maturity needed to bloom. You are much better off trying to locate a cutting to root or a small division.

I am not sure where locally you would be able to find seeds, cuttings or divisions, but I have had good luck searching sites like eBay or Etsy for small sellers who deal in these kinds of plant product and would be willing to ship to your part of the world.

This article should help you with that: https://www.gardeningknowhow.com/ornamental/vines/wisteria/transplant-wisteria-vines.htm

I have only heard that it takes that long if they are grown from seed. You may need to prune your vine in order to coax it to bloom. These vines do not need fertilizer, as they will grow excessively--too much can also inhibit flowering. Check the light it receives, as too little will affect blooming as well. If you have not read it, you may find this article helpful: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm

The plant could be suffering from crown gall. These articles will help determine if this is the issue: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-diseases.htm, https://www.gardeningknowhow.com/plant-problems/disease/how-to-fix-crown-gall.htm

The soil may have too much nitrogen. Try to offset it with some phosphorus, like bone meal, to help promote more lush blooms. This article should also help: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm