Personally I really like Pulltap cork screws. The Niagara College Teaching Winery (in Niagara-on-the-Lake Ontario Canada) has been selling a very good corkscrew that works similar to a Pulltap (and may be better construction). But (a) I don't know the brand, and (b) haven't been their since before Christmas, so they may not have it any more.
Low cost? Well that means different stuff to different folks, and depends on quantity of purchase.
Steve