Weekly TB Index: Storage Prices Every Monday by Email
The weekly TB index from ratioDB is a free email that shows every Monday how prices per TB for hard drives, SSDs and RAM on amazon.com moved over 7 days. Over the last 7 days: hard drives +0.4%, NVMe SSDs +0.8%, DDR5 RAM +0.4% (as of Oct 28, 2026). You get at most 1 email a week and unsubscribe with 1 click.
What is in the weekly TB index?
Every Monday email starts with the week in 1 sentence and then shows a chart, product types, biggest drops and rises, new 90-day lows, your section, news, guides and the tip of the week.
- Summary: how hard drives, NVMe SSDs and DDR5 RAM moved over 7 days.
- Chart: the TB index over the last 90 days in percent, with the last 7 days highlighted.
- Product types: the change per product type with a dot for buying timing: green up to 2% above the 90-day low, yellow up to 6%, red above that.
- Biggest drops and rises: the 5 largest price drops and the 3 largest increases of the week.
- New 90-day lows: products that are as cheap as they have not been in 90 days.
- Your section: how far your price alerts are from their targets and how your watchlist changed since you saved it.
- News and guides: the storage market news of the week with market reaction and new guides.
- Tip of the week: 1 question with an answer from the ratioDB guides.
The email shows changes in percent. Current prices with timestamp and source are a click away on ratioDB.
When does the email arrive?
Every Monday from 8:00 in your time zone. On the 1st Monday of the month you get the monthly review with the values of the last 30 days instead of the weekly report.
ratioDB takes the time zone from your browser when you sign up. You only get more than 1 email a week if you also set a price alert and it fires.
How much does the weekly TB index cost?
Nothing. You sign up with your email address and tap the link in the confirmation email, no password needed.
Every email has an unsubscribe link at the bottom. You can also unsubscribe under My price alerts in the settings, where you can subscribe again as well.
What does the TB index show?
The TB index is the median price per TB of the 10 cheapest new listings of a product type. It shows the realistic market price without a single bait offer skewing it.
TB index per product type, as of Oct 28, 2026, source amazon.com
| Product type | TB index | 7 days | 90-day low |
|---|---|---|---|
| HDD internal 3.5" | $36.25/TB | +0.4% | $34.37/TB |
| HDD external | $43.68/TB | +0.7% | $41.57/TB |
| SSD NVMe | $133.85/TB | +0.8% | $125.00/TB |
| SSD SATA | $121.03/TB | +1.2% | $118.69/TB |
| SSD external | $125.50/TB | −0.4% | $119.49/TB |
| microSD | $0.207/GB | −0.3% | $0.207/GB |
| RAM DDR5 | $15.58/GB | +0.4% | $13.22/GB |
| LTO-8 to 10 | $6.79/TB | 0.0% | $6.25/TB |
The methodology explains how ratioDB calculates.
Weekly TB index FAQ
Can I subscribe without a price alert?
Yes. Tap "Subscribe to the weekly TB index" above, enter your address and confirm the link. You do not need a price alert.
How do I unsubscribe?
With the link at the bottom of every email or under My price alerts in the settings. Your price alerts keep running.
Does the email contain ads?
The email contains no third-party ads, only percentages, news and links to ratioDB.
Is there a TB index for amazon.de?
Yes. On the German site of ratioDB you get the weekly TB index for amazon.de in German.
Who sends the email?
The email comes from alarm@ratiodb.com and is sent through the email service Brevo. If you reply, your message reaches ratioDB at support@ratiodb.com.
Where can I see the current TB index at any time?
On the ratioDB home page, for hard drives under hard drives, for SSDs under SSDs and for memory under RAM.