Glacier is going to be a cheaper option that you can choose as an S3 user, but retrieval is going to take a lot longer.
Here is a question from the Glacier FAQs on retrieval on point:
Q: How can I retrieve data from the service?
You can download data directly from the service using the service’s REST API. When you make a request to retrieve data from Glacier, you initiate a retrieval job. Once the retrieval job completes, your data will be available to download for 24 hours. Retrieval jobs typically complete within 3-5 hours.