The blue labs PH dosiers are over $400 these days. I am glad I bought mine for the RDWC and it was a stretch for me @ under $300. Its totally worth it but you have to have the $ first. I did finally have to replace my sensor but they are down to $45 now from $90 when I bought it.

It makes 0 sense to me why component prices will go down and assemblies would go up