The new prices will be implemented on April 17. Click here to see the new prices. The best way to handle this increase is to use calculated shipping on your eBay orders. eBay integrates with the USPS and when you use calculated shipping, the shipping fee is calculated based on the seller's zip code, the buyer's zip code, the weight of the package, and the class of mail. It is the most fair way to calculate shipping charges. The video below explains how to use the calculated shipping feature if you are not familiar with it.
And, in case you are not aware, you can print your shipping labels directly from your eBay Selling Manager. It is easy, fast, and free. Here is a video on how to print your shipping labels from eBay after a sale: