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    <p>I would start with something like this:</p> <pre><code>$(function () { ​var CartViewModel = { var self = this; self.cartItems = ko.observableArray([]); self.eligibleForFreebies = ko.computed(function() { return ko.utils.arrayFirst(self.cartItems(), function(cartItem) { // I forgot the () after itemType in the original post return (cartItem.itemType() === 'subscription'); }); // Note: ko.utils.arrayFirst will either return the item in // question, or it will return undefined or null… // I forget which, but either will result in // eligibleForFreebies evaluating to false }); }; var Product = function() { var self = this; self.itemName = ko.observable(); self.itemDesc = ko.observable(); self.itemType = ko.observable(); self.itemPrice = ko.observable(); self.itemFreebies = ko.observableArray([]); }; var Freebie = function() { var self = this; self.freebieName = ko.observable(); self.freebieDesc = ko.observable(); self.freebieOriginalPrice = ko.observable(); } ko.applyBindings(new CartViewModel()); // load data }); </code></pre> <p>​</p> <p>Load Products into the cartItems observableArray in the CartViewModel.</p> <p>The dependent observable (ko.computed) value <code>eligibleForFreebies</code> will determine whether or not the Freebies should be allowed.</p> <p>It's likely that you wouldn't even need to remove the freebies from the Products when the cart is not eligible for them – simply check <code>eligibleForFreebies</code> and include or exclude the freebies from the display, invoice, etc. (This might save you the headache of retrieving freebies after the user adds the subscription, but I suppose that depends on your scenario.)</p> <p>Hope this helps to get you started on this one, but let me know if you have any questions.</p> <p><strong>UPDATE:</strong> I <a href="http://jsfiddle.net/yUpWe/29/" rel="nofollow">forked your fiddle</a> and reworked your code a bit... well, I mostly moved it around, but I did add some functionality.</p> <p>Notice that if you delete the subscription item from the cart, all the freebies disappear from the cart display--but I didn't delete them from the objects!</p> <p>If one adds a method for re-adding a subscription item to the cart, the freebies would reappear.</p> <p>Please have a look when you have a chance, and let me know if you'd like me to explain anything.</p>
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    1. COHiya Jimmy. Thanks so much for the suggestion. I'm not completely clear on how to add the items from the `cartItems` array using the `Products` and `Freebie` objects. Here's a jsFiddle of my existing code: http://jsfiddle.net/brandondurham/g3exx/
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    2. COHi Jimmy. Thank so much for putting that together. One question: Do you know why the `beforeRemoveAnimation` on the freebies?
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    3. COSo I actually do need to remove those freebies objects when the subscription is removed as I'll be sending this JSON to the serve when the user goes to check out. It's safe, though, as adding the subscription back happens on another page. I don't have to worry about capturing that here.
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