Zen Cart Custom Mod

I need a custom Mod created for Zen Cart Version 1.3.6. by Noon EST May 7th! The site already has some customizations and I need those not to break and cannot upgrade at the moment....so upgrading is NOT an option. I will provide the current site via a zip file to the selected contractor. What I need is group based pricing off of product categories. There is a mod that works for the newest version of Zen Cart but works on the individual product....this could possibly be used as a reference to help speed things along. [login to view URL];products_id=256 On the category page in the admin panel....a dynamic section should appear which shows all of the Group Pricing groups which have been setup in the standard Group Pricing module. For each Group, I need to be able to set the discount by % for an individual Category of products. If the Category has Sub-Categories, then those sub-categories should automatically get the same discount as the parent by default but should also allow setting of a different discount amount for that particular sub-category. There should not be a limit to the number of pricing Groups that can be added. If the customer is logged into the front-end of the site, their discount price should appear next to the product without having to add the item to the shopping cart. The module should be VERY stable by tomorrow....but should any problem arise within 7 days after, the problem will need to be fixed by you at no additional cost. If the chosen developer has a good rating on GAF, I would be happy to make final payment immediately upon completion...if it is a new person, I will want to hold 25% of project in escrow pending working out any bugs. Please feel free to ask me any questions....I will be available for the next several hours.