This might be useful to someone, somewhere, out there.
Those who’re into tinkering with things they shouldn’t will notice that Ebuyer’s search pages include a “limit” GET variable in the results page URL. The upper limit appears to be 30, but going negatively causes a different kettle of fish:
http://www.ebuyer.com/search?q=a%25&x=0&y=0&limit=-3000
(That URL is not for the feint hearted!)
It makes one wonder, is there a little bit of sanitization fail?