Build a retail restock monitor + fast-checkout assistant

Overview: I need a tool that monitors product pages on major retail sites for availability and helps me check out quickly on my own account when items I want come back in stock. This is for my own purchasing, not multi-account operation. Core features: Monitor a configurable list of product URLs (Walmart, Costco, others) for stock status and price changes Send instant alerts when a watched item comes in stock or drops in price (email, SMS, or Discord/Telegram webhook) Optional assisted checkout that pre-fills my saved shipping/payment info on my own logged-in session to save time at purchase Simple dashboard to add/remove watched products and view status Respect each site's rate limits and robots directives; reasonable polling intervals, no aggressive hammering Most likely will need: Multi-account creation or management Proxy rotation or IP evasion CAPTCHA or 2FA bypassing Automated bulk purchasing designed to evade per-customer limits Tech notes: Prefer Python or Node Should run reliably as a background service (VPS or my own machine) Clean, documented code I can maintain and extend Config-driven so I can add new sites/products without code changes