@ Kraker: there's nothing to stock up. Paper expires very quickly and gets unusable with colour casts impossible to control, and chemicals even when sealed new last few months before being as effective as rotten water. I strongly suggest you to buy what you can use in few weeks (pray it's fresh stuff and not warehouse leftovers...) and then say goodbye.
Sorry, but this does not match my experience. I used a batch of chemicals & paper in the course of over a year, and while color balance did shift quite a bit, the results were still good after color adjustments. The bottles were opened for at least half a year before the chemicals were used up, and both chems and paper were stored in a cellar with temperatures of about 20°C and high humidity. Changing color balance is not nice but not a show stopper either, people who look for ease of use and convenience should get a smart phone instead.
Trying to be the best of whatever I am, even if what I am is no good.