UPC Codes – Will GTIN work?

Hello guys,

First product, and I am confused on GS1 codes. They have 10 for 250 + $50 annually.

They also have a GTIN code for $30.

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I am selling a product that will have two variations, possibly 3 later down the line. However, for now, and for the next 6 months it will just be one variation most likely.

Will buying the GTIN for now be ok? I am trying to keep cost low as of now if possible.