I'm interesting in trying out priceline.com when i start interviewing to save some money. for those who've used it before, have any comments/suggestions/caveats? i.e. say i wanna fly from one place to another and back. i enter the two airports. in priceline. it will automatically give me a roundtrip price, or is it one-way? would entering $100 for a east to west coast flight be realistic?