We've given up on the commercial posts, Moe, and are looking into building our own. I'll let you know how it goes.
Meanwhile, my cat enjoys scratching at the back of one of those $4 kitchen rugs (cats seem to love rug backing). We have to buy her a new one 2 or 3 times a year, but it keeps her from tearing up things she's not supposed to and she's very attached to them. We get a "greeting scratch" when we come home in the evenings and she throws a royal fit if her rug is relocated. We're thinking of using one of those rugs on her scratching post instead of carpeting.