LAMP Developer to fix some bugs. PHP MySQL

We have a current website run on LAMP and we need some minor modifications. 1. The back end inventory management system shows pricing and we need to change one of our forms to show a different value. 2. When a user inputs the values for all the products on the form, we need to have a check box and a field. So that when a user checks the box, they overwrite the automated values with the manual entry. 3. On the public website, We need to create a drop down so that users can search by price highest to lowest and lowest to highest. We have the designs for these 3 items above. We need them programmed. Please place your bid and start with the word, "Waffle" this will ensure us that you can read simple instructions and you are not using a bot to bid. We have a lot of work and we are hoping to build a long term relationship.