Where can I buy a SPX6900?

Excuse me, I was wondering if you could assist me in finding a place to purchase a SPX6900. I've been searching online and in local stores, but I haven't been able to locate one. Could you possibly recommend a specific retailer or online platform that might stock this product? I'm particularly interested in purchasing it as soon as possible, so any information you could provide would be greatly appreciated. Thank you in advance for your help.