Specifically with an eye to collectors, manufacturers of collectable model figures make chase figures. This is a model figure that is released in limited amounts relative to the rest of an assortment, often something like "one chase figure for every two cases of regular product" or similar. This is comparable to the chase cards in the collectible card game industry. The name comes from the assumption that collectors, in their need to "collect them all" will put in more effort than usual to "chase" down these figures.