This plugin, an extension to the Products' Options' Stock Manager, enhances that plugin to allow you to customize your products' option-combinations (a.k.a. product-variants) to specify the variant-specific price and weight. The price/weight support is enabled on a product-by-product basis.
Variant pricing includes setting of the product variant's base price, an optional one-time price and an indication as to whether the base price is discountable. All pricing flows through both the admin-level product displays and the store-side processing.
If a product is POSM-PW-managed, then the price and weight input fields when editing the product are, instead, displayed as a button linked to the Catalog->Manage Options' Stock page to allow entry of the variant-specific price and weight values.
For the full details, please refer to the plugin's readme — accessed by clicking the "Readme" button below.
Note: Requires prior installation of the Products' Options' Stock Manager, v2.1.8 or later.