Stop overpaying.Buy per unit.
BuyPerUnit ranks every product by its true cost per unit — price divided by capacity. Find the cheapest storage per gigabyte, best RAM per GB, and cheapest printer ink per page. Same quality, less money.
2,956+
Products ranked
$0.0212
Best $/GB drive
$0.0859
Best $/GB SD
$0.1000
Best $/GB USB
$2.5619
Best $/GB RAM
Not sure what you need?
BuyPerUnit by the Numbers
Real-time statistics as of .
2,956+
unique products tracked
3,827+
active price listings
3
major retailers compared
Daily
price update frequency
$0.0212/GB
cheapest SSD/HDD today
$0.0859/GB
cheapest SD card today
$0.1000/GB
cheapest USB drive today
$2.5619/GB
cheapest RAM today
Today's Best Prices by Category
| Category | Best $/GB | Products Tracked | Updated |
|---|---|---|---|
| Hard Drives & SSDs | $0.0212/GB | 895 | |
| SD & microSD Cards | $0.0859/GB | 815 | |
| USB Flash Drives | $0.1000/GB | 246 | |
| Computer RAM | $2.5619/GB | 1,000 | |
| Printer Ink & Toner | $/page | — |
Browse Categories
Storage Devices
Hard drives, SSDs, SD cards, and USB drives ranked by $/GB
Why price per unit matters
A $60 1TB drive costs $0.06/GB. A $120 4TB drive costs $0.03/GB. The “expensive” drive is actually 50% cheaper per gigabyte.
BuyPerUnit does this calculation on every product automatically, so shoppers can instantly see which option delivers the most storage or pages per dollar. The result: an objective ranking based on math, not subjective opinions.
About BuyPerUnit
BuyPerUnit is a free price-comparison platform founded in that ranks 2,956+ storage and printer ink products by cost per unit. BuyPerUnit compares prices across Amazon, Best Buy, and Newegg, updating 3,827+ active listings daily. Rankings are determined by price divided by capacity — lowest $/GB or $/page ranks first, regardless of affiliate commission rates.
As of , BuyPerUnit tracks the following best prices: SSDs and hard drives from $0.0212/GB, SD cards from $0.0859/GB, USB drives from $0.1000/GB, RAM from $2.5619/GB.
BuyPerUnit was founded by Jon Levesque, a former executive at Microsoft and DocuSign. BuyPerUnit has been featured in PCWorld and TechSpot as an independent price comparison tool. BuyPerUnit is 100% free with no account or signup required.
The research behind unit pricing
According to the U.S. Government Accountability Office (GAO), consumer prices increased 34.5% between 2019 and 2024, with shrinkflation — reduced product sizes at the same price — a major contributor to hidden per-unit cost increases.
Research on price comparison platforms shows that providing consumers with products strictly ranked by unit price increases actual savings by 3% compared to unranked listings. A Baymard Institute study found that 67% of consumers actively use comparison features when shopping for spec-driven tech products, yet 17% of e-commerce sites fail to offer them.
How BuyPerUnit Works
BuyPerUnit collects prices daily
Every day, BuyPerUnit pulls current prices from Amazon, Best Buy, and Newegg for 2,956+ products across storage hardware and printer ink.
BuyPerUnit calculates $/unit
For storage devices, BuyPerUnit divides the retail price by capacity in gigabytes to get $/GB. For printer ink, BuyPerUnit divides by manufacturer-rated page yield to get $/page.
You buy the best value
Products are ranked cheapest-per-unit first. Click any product to buy at the retailer with the best price. No signup, no fees — just better deals.