# Price comparison

For **Roundups** and **Reviews**, you can enable the price comparison feature to display additional "Buy Now" buttons from alternative product sources.

<figure><img src="/files/pg9LEJicKbk09mSpLhgS" alt=""><figcaption></figcaption></figure>

### **How Price Comparison Works**

The most reliable way to merge products from different modules into a single comparison list is by searching **via EAN**.

<figure><img src="/files/eMLJ4cppuS4qAO4tzre6" alt=""><figcaption></figcaption></figure>

{% hint style="warning" %}
To use this feature, you must enable **Content Egg** modules that support **EAN search**, in addition to your **main affiliate module**.
{% endhint %}

#### **Supported Modules for EAN Search**

{% hint style="success" %}
We recommend using [Sovrn](/getting-started/quick-start.md), as it has a large product database and does not require individual advertiser approvals.
{% endhint %}

* Amazon
* Amazon No API
* BestBuy
* Bol.com
* CJ Products
* eBay
* Kelkoo
* Kieskeurig.nl
* Sovrn (VigLink)
* Tradedoubler Products
* Tradetracker Products
* Walmart
* Webgains


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