Adding Selected Option Prices for Checkboxes - Using Svelte

I'm trying to get update the total as the checkboxes are selected and unselected (incase the user changes their mind and no longer wants the item). But I'm not sure how to get the actual value I have assigned to each toy. For example: If the user selects toy 1 and 3 they should see: You ordered Toy1, Toy3 and your total is $6.00. For now I assigned the values with the names themselves which isn't what I want but I just put that to show what I'm trying to do. Is their something else I should be using actually perform an operation to get the total?

<script>
        let toylist = [];
        let toynames = [
                     'Toy1 5.00',
           'Toy2 5.00',
                     'Toy3 1.00',
        ];

        function join(toylist) {
            return toylist.join(', ');
        }
</script>
    {#each toynames as toy}
        <label>
            <input type=checkbox bind:group={toylist} value={toy}> {toy}
        </label>
    {/each}

    {#if toylist.length === 0}
        <p>Pick at least one toy</p>
     {:else}
        <p>
           You ordered {toylist.join(', ')} and your total is
        </p>
    {/if}