Great buy! I wish our Harbor Freight ever had any of them. Every time I go in they're out! I've bought the carpet cutters for $3.99 and gotten the three blades out of those before too. You'll love the blades! I think they last even longer than the ones you get at the fabric stores.
In their bathroom department they also have grippers that work just like the Gypsy grippers but at a MUCH lower price. They come in various sizes/prices. You can get inexpensive metal tape measures for snap bags there too.