Getting Price and Add to Cart Button. Any thoughts on what I am doing wrong
I am a little confused with your twig code assigning so many variables.

Put simply, only a purchasableId can be used to add something to the cart.

If you know the product ID then it is as simple as:

{% set product = craft.commerce.products.id(6901}.first() %}

{% if product %}
    &lt;form method="POST"&gt;
        &lt;input type="hidden" name="action" value="commerce/cart/updateCart"&gt;
        &lt;input type="hidden" name="redirect" value="commerce/cart"&gt;
        &lt;input type="hidden" name="qty" value="1"&gt;
        &lt;input type="hidden" name="purchasableId" value="{{ product.defaultVariant.purchasableId }}"&gt;

        &lt;button type="submit"&gt;BUY NOW {{ product.defaultPrice|commerceCurrency }}&lt;/button&gt;
    &lt;/form&gt;
{% endif %}