Fix my Excel spreadsheet -- 2

I have an excel spreadsheet with multiple tabs used for price list, but there are errors and it's not very well laid out. I want it to reference prices and costs in various cells and tabs, but easy to update prices and formulas that are not too difficult to replicate moving forward. You need to be available during AU business hours for me to discuss work, and I need to be able to contact you and discuss via Teams screen share or via phone.