Yes you can, but you'll have to buy Sparkcash to do it.
You can either buy a Cash Shop House. Which usually last for 30days and will increase your vendin inv for an additional 5 spaces.[
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Or you can also use Sign of Tycoon which will increase your vending inventory with 10 spaces for 30 days.[
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Keep in mind a total of 20 spaces are max for your vending.