Hi,
I have 2 options for you.
1. Make a fixed application with your product. The price is 100-200 usd. If you need to update your product. You will need update this application again.
2. Make a website for you shop too. And fetch project from this website too. But the price is 500-800usd for this. And you need to pay the website host every year. The advantage of this option is: you can update your product any time you want.
Please message me, I can't message you, I would like to hear more about this project. Hope we can chat for a while before making a choice on your developer.
I'm new bidder but already have 3 years experience focusing in IOS development.
Thank you,
Son.