The e-retailer began selling two Android smartphones on its website on Wednesday, each at about a $50 discount—the R1 HD is being sold at a starting price of $50, and Lenovo’s fourth-generation Moto G begins at $150, according to the Wall Street Journal.

Both of these offers are Prime Exclusives, meaning they’re only available to customers who pay either $11 a month or $100 a year for Amazon’s Prime service. In addition to discounted Android phones, the service also offers customers two-day shipping, unlimited photo storage, and unlimited streaming of music, television shows, and movies.

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Amazon is able to sell the two cellphones at a discounted rate because they’re supported by ads, which will show up on your lock screen. If you don’t want the ads, you’ll have to fork over that extra $50. The phones will also come pre-loaded with Amazon apps, similar to the Fire Phone. You won’t be able to delete them, but you can remove them from your home screen.