Analogue is shitty about supply. I understand they are a small company and can't make an infinite supply like nintendo, Sony and Microsoft can but their scarcity market is insane. I checked the reddit and it seems like its a lot of fanboys and scalpers that scoop up all the units and leave few for the rest of us.
Luckily I've been able to score an NT, Super NT, Pocket and 3D without too much trouble and now I can actually play my old cartridges on modern TVs again. I learned my lesson with the pocket though and waited until the colored versions came out for the 3D.
Only SD card I've ever had die. I go with sandisk for important SD cards and team group for less important ones. Neither have ever failed.