Single-Product WordPress Sales Page

I need a clean, conversion-focused WordPress page that presents one product and takes the customer straight to checkout. The flow is simple: the visitor sees persuasive copy and images, chooses the quantity, and pays immediately by credit or debit card (no PayPal, no COD)... (Budget: $10 - $30 USD, Jobs: HTML, Payment Gateway Integration, PHP, Stripe, Web Design, Website Design, WooCommerce, WordPress)