Slinder: Feet are very individual and although you can buy shoes, etc. by size, it's not recommended for ski boots. Remember, we're buckling these things tight to our feet and ankes and calfs.
For this reason, you'll find very few ski boots being sold on the net. There is too big of a chance of disappointment. Chances are, you will be disappointed.
I'm guessing the "slinder" is a play on words for "slender" and if that is true the feet are small. You may be able to fit into junior boots and their are some goods ones out there at a very decent price. (Relatively speaking, of course)