If you are searching within a brand/category listed on the right, I probably haven't gotten around to those listings yet (the AVCA is a big project). It's also possible I or my sources missed something. Crutchfield isn't perfect, but eBay is ;)

The text field isn't a very smart one (yet). For search strings, enter only one thing and try to see how I've worded it in the listings (ex. "Dolby B Noise Reduction" won't return anything, neither will "B NR, Headphone Jack", only "B NR" will). You can also use the text field to search by model number, but include only the partial/full number without dashes or spaces ("Kenwood KRA5070" won't return anything, "KRA5070" will). The Brand/ Category/ Year boxes can be used to limit your text search, but make sure they're set to "Any" when you don't mean to use them.