The reason i left this as a input rather than a select is if in the future, any member ship price change requires a soucecode update, and also any discount we are giving will either not flexible or not be reflected in the history.

This page was to be used by stuff member, i think 2 alternatives are:
1. combobox which allows you to key in the amount or select from a drop down.
2. normal text input with autocompeletion

What do  you think?