speccode

<h4>How it works</h4>
<ul>
<li>Plugin will store your “price” as float so any time you will change desire number format there will be no reformatting problems.</li>
<li>Best column type in database for “price” related fields is decimal. As WordPress keep meta as type “text”  I can only cast it to float. Keep it in mind.</li>
<li>Field validation is “live” thanks to https://github.com/teamdf/jquery-number.</li>
<li>When you use <code>get_field</code> function you will get preformatted number based on your settings.</li>
</ul>
<h4>Options</h4>
<pre><code>format
</code></pre>
<p>Available formats:<br />
* <code>1 337.55</code><br />
* <code>1 337,55</code><br />
* <code>1,337.55</code><br />
* <code>1.337,55</code><br />
* <code>1337</code><br />
* <code>1 337</code></p>
<h4>Default parameters result</h4>
<pre><code>1 337.00
</code></pre>
<h4>Compatibility</h4>
<p>This ACF field type is compatible with:<br />
* ACF 5<br />
* ACF 4</p>


Advanced Custom Fields: Price Field

It's little bit disappointing that plugins like this is only available as an add on. This plugin adds that extra professional touch, so thank you very much...

This should be in the ACF core

GoldBroker

<p>Live Precious Metals price widgets. Gold, Silver, Palladium and Platinum price widgets. This plugin allow you to display real time gold & silver price charts in any of your widget areas.<br />
The widgets are automatically updated every minute from Monday to Friday and are availables in 119 currencies.</p>
<h4>Features</h4>
<ul>
<li>Live Gold Price</li>
<li>Live Gold Price Chart</li>
<li>Gold Price’s Daily performance</li>
<li>Live Silver Price</li>
<li>Live Silver Price Chart</li>
<li>Silver Price’s Daily performance</li>
<li>Live Palladium Price</li>
<li>Live Palladium Price Chart</li>
<li>Palladium Price’s Daily performance</li>
<li>Live Platinum Price</li>
<li>Live Platinum Price Chart</li>
<li>Platinum Price’s Daily performance</li>
<li>Updated every minute</li>
<li>Choose between 119 currencies</li>
<li>Price per oz, gram or kilogram</li>
<li>translated in 5 languages, English, Spanish, French, German and Italian </li>
<li>Customize width and height</li>
<li>Easy to customize with CSS</li>
<li>Works in all major browsers – I9+, Opera, Safari, Firefox, Chrome</li>
</ul>
<h4>Demo</h4>
<ul>
<li>Click this link for Gold Price widgets demo https://www.goldbroker.com/widgets/gold</li>
<li>Click this link for Silver price widgets demo https://www.goldbroker.com/widgets/silver</li>
</ul>


Live Gold Price & Silver Price Charts Widgets

The plugin does exactly what it offers.

Yet, in my opinion, it is poorly implemented. The plugin merely includes iframe code from www.goldbroker.com instead of directly fetching the prices from an API and displaying it itself (without an iframe). 
(The same functionality could be achieved by copying the iframe code (with the url and the needed parameters) and pasting it into a text widget.)

Works, but bad implementation

Live Gold & Silver price chart - Updated every minute - Easy to install & to customize

Advanced Custom Fields: Price Field vs Live Gold Price & Silver Price Charts Widgets