WooCommerce BOGO & Variations Update

I need two focused tweaks made to my live WooCommerce store and I want them implemented cleanly so nothing else on the site or in the checkout flow is disturbed. Buy 2, Get 1 Free • The offer applies to specific items only; I’ll give you the exact SKUs... (Budget: $10 - $30 USD, Jobs: API Integration, CSS, JavaScript, MySQL, PHP, Web Development, WooCommerce, WordPress)