The Purrfect Post Deluxe is Skritch's more budget-conscious cousin.
A little less focused on the cool cat aesthetics (though still good-looking) and a little more focused on feline happiness, PurrFect Post is vet-designed and has the same excellent sisal scratching surface. The deluxe model includes a horizontal scratching surface on the base as well as the sisal-covered vertical post.
(Another product they sell, the PurrFect Angle Scratcher, has an inclined surface, for cats who are so uh...inclined.)
$69.95, direct from the manufacturer.