For thermal till rolls measuring 80mm x 80mm, these are commonly used in various point-of-sale (POS) systems and receipt printers. Here are a few things to consider when looking for these rolls:

1. Quality: Look for high-quality thermal paper to ensure clear and legible receipts.
2. Core Size: Check the core size (usually 12mm or 25mm) to ensure compatibility with your printer.
3. Quantity: Consider purchasing in bulk for cost savings, as they often come in packs.
4. Compatibility: Ensure they are compatible with your specific POS printer model.