PHP/SQL gun for custom osCommerce site

We require work on our already-customised osCommerce site. We have products listed with up to three attributes and wish to: 1. Arrange "bundled product" discounts as per cent proportion or dollar amount 2. Correctly monitor inventory considering product attributes and bundles 3. Apply a special case bundled discount in one category: purchase separate components within a year and still receive a dollar amount discount 4. Fix a bug in add-on code to correctly calculate package weight/price for manual orders 5. Apply wholesale discount options for manual orders (per item in addition to the already-installed total discount) 6. Create quote option for manual orders 7. Limit order editing privileges per admin and/or per order status