You're referring to the Classified Ad listing format, right? Sure, you could use the new Finding API call findItemsAdvanced and using the itemFilter option to limit your results just to Classifieds.
Also, try this: Go to any eBay page with a search box and click the Advanced Search link. Then, compose your search options, selecting Classified Ads as the Buying Format, then Search. Ok, you're seeing search results, right? Find the RSS link at the bottom - that may be the feed you're seeking.
