For large panoramas, a good local pro print lab is often the best starting point. A quality lab or small print shop can advise on size, paper, color, and mounting, and may even let you upload online while still giving you personal support.

Another practical option is a signage printer. Shops that print large vinyl graphics can produce very large panoramic prints at lower cost than some photo labs. These prints can be waterproof, abrasion-resistant, and fairly fade-resistant, then mounted to a rigid backing for display.

If you prefer online services, some labs charge by the inch and can handle nonstandard panorama sizes. Higher-end services may offer ICC color profiles, test proofs, and other color-managed workflow tools, which is useful when quality is critical.

Also keep framing in mind: standard frames rarely fit panoramic ratios, so custom framing or made-to-size frames are often necessary.

In short: for the best quality and guidance, try a reputable local photo lab; for large, durable, budget-friendly output, try a sign printer; and for convenience, use an online lab that supports custom sizes and color-managed printing.