You gotta watch anything you buy on eBay, especially if it's not a "brand-name" product, but rather just a product that is advertised by a seller, and usually it's being advertised by multiple-sellers, and their prices are cents-apart...These kinds of products are sold by sellers who do "Drop-Shipping" in massive numbers. They typically sign-up with a Drop-Shipping company, choose the products they want to sell, choose the quantity they want to buy, get their bulk-pricing based on how many they are buying, then they set their prices based on how much profit they want to make, which is based on how many they buy in the first place. This is why they are usually cents-apart in pricing: one seller buys 500 of the product, the next buys 600, and they get theirs for $.05 cheaper, therefore they sell them for $.05 cheaper...And in the meantime, these Drop-Shipping companies are buying their products from cheap, wholesale factories that manufacture everything from pet products to musical instrument accessories (bit one, they sell cheap picks, guitar tuners, cables, etc.) to home goods...and they are often very cheaply-made and they do usually misrepresent their quality...
If the bowls are rusting without the use of bleach or other salts, then they aren't stainless-steel obviously, probably just plated with nickel or sterling-silver (plated only)...I'd toss them obviously at this point, kind of hard to use a water dish that rusts, lol...
In my experience, and I buy a lot on eBay and save a ton of money, only buy from either a seller who is selling a brand-name product that you can specifically look-up online and go to their website and research that specific product, or only buy from private, individual sellers who are only selling a small amount of items, or only a few, and who are not selling hundreds or thousands of cheap products at once...
