Yes, you can create a tariff with different prices for Shop. To do this you must create the tariff from Settings > Basic Settings > Pricing Rates > +New.
Once you have created the rate you must indicate the price, you can do this by accessing the products tab > Rates tab, click on the rate and indicate the corresponding price. You can also do it massively, click here.
Once you have indicated the price of the tariff in the products, go to Features > My STEL Shop > Portal > Users tab, in the field Guest Tariff/Public Tariff, indicate the Tariff created for the shop.
Remember to click on Publish draft.