Hello! I'm sorry to hear about your lost sim card. You may want to check online marketplaces like Carousell, Lazada, or Shopee for sellers offering old sims with unlimited data. Additionally, you can try visiting local cellphone shops or asking around in your area if anyone has a spare sim card to sell. Make sure to verify the legitimacy of the seller and the sim card before making any transactions. Good luck in finding a replacement sim card with unlimited data!