I recently posted on the Suzuki M-37. It’s a good melodica, but it is difficult to assemble and disassemble, much more so than the other Suzukis. The metal tray is a much tighter fit on the M-37, and it has to be pried open with screw drivers or other levers, and then it is difficult to get back together. The screw holes also are hard to line up during re-assembly. I don’t know what country you are in, Benjamin, but The Yamaha P-37D can be ordered from Japan for about $110 US delivered, if you look around on Rakuten Global and eBay.