Hi
I guess your spreadsheet includes some tags about your boots, like "waterproof", "suede", "comfort soles" which is related to your product line.
I'm an expert PHP developer but also code in C, Node.js and few other languages. But since your store is a kiosk, a JS based web app is the best choice as its platform agnostic.
I can make it very flexible for you, and if you're comfortable with your Excel tables, so be it! I can get the data from sheets and use it in app.
Please feel free to ask anything you need to! I dont ask upfront payments and you pay once its done to your specs.
Best regards,
Baris Atasoy