Maybe you need a knife sharpener instead? Any knife will cut tomatoes if it's sharp enough. At trade shows it's a common demonstration technique amongst knife sellers - how well their knives tackle ripe tomatoes!
This one is only £3 (less than $4) and looks good - but obviously not something you can get where you are.
https://www.cookshopclearance.co.uk...Ajco_Pdqo9JZXbwCi8SH9iKa0movzXGhoCmSYQAvD_BwE
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That an interesting shape, i have never seen one like it, i wonder what the benefit is of the tip shaped like that...