Looking for a numerical keypad to plug into your laptop for quick (ten-key) input?
Here are my top three choices:

Hardware Choice # 1
Heavy Duty Calculator, 12 DGT Display, USB Connectivity, 4.6 LPS Printer VCT12807

$112.47
Product Description
Victor Calculator 1280-7 Heavy Duty Commercial Calculator with USB Connection Cab
engineersupply.com
Victor Heavy Duty Commercial 1280-7 works both as a stand-alone desktop printing calculator or connected to your PC allowing you to send your calculation results directly to your computer program for easy analysis in spreadsheets. Can also be used as a numeric entry keypad. Extra Large 12 Digit Fluorescent Display. Fast and Heavy Duty 4.6 LPS 2 Color Ribbon Printer. 2 Independent Tax Keys. Cost-Sell-Margin Keys. Time/Date Feature both displays and prints. 4 Key Independent Memory. Delta Percent-percent of change. Units Price Mode. Grand Total Function. Change Sign Key. Percent Key. Sigma Key. Item Count. Date/Non-Add Key. Backspace Keys. Includes USB Cable. Compatible with Windows 98/98SE/ME/2000/XP. 3 Year Warranty, when other brands only offer a 6 month to one-year warranty.

Victor Heavy Duty Commercial 1280-7 works both as a stand-alone desktop printing calculator or connected to your PC allowing you to send your calculation results directly to your computer program for easy analysis in spreadsheets.
Can also be used as a numeric entry keypad.
Extra Large 12 Digit Fluorescent Display.
Fast and Heavy Duty 4.6 LPS 2 Color Ribbon Printer.

Hardware choice # 2
$19.99
Compucessory 12 digit display calculator with USB port model # 22082
12-Digit USB Calculator for Use at Home and Work
Nothing But Software
The Compucessory 12-Digit Display Calculator with PC Interface features a large liquid crystal display (LCD) for easy viewing. The calculator functions include tax rate calculation, cost-sell-margin calculation and backspace key. The calculator allows you to send calculation result to a PC, runs on solar power, and includes a USB cable.
12-digit Calculator has a Large Liquid Crystal Display (LCD)
PC Interface
10-Key Keyboard for Notebook PC
Functions Include:
Tax Rate Calculation Function
Cost-Sell-Margin Calculation
Backspace Key
Send Calculation Result to a PC
Runs on Solar Power
Compucessory 12-Digit Display Calculator with USB Port
USB Cable
Color: Silver/Black
Dimensions: 5.5" x 7.5" x 1.5" (H x W x D)
Power Source: Solar / Power Adapter
Display: 12 Character - LCD
Calculator Feature: PC Link

Hardware Choice # 3
$10.20
Royal Machines K12 PC Calculator with Built-in 3 Port Hub and 12 Digit EZVue Display
amazon.com
Royal Machines K12 PC Calculator with Built-in 3 Port Hub and 12 Digit EZVue Display
PC Numeric Keypad w/ Dedicated PC Cusor Keys
One-Touch Keys for Launching Email, Web Browsers & Search Functions
Comfort-Touch
Color Coded Keys

Royal PC Keypad/calculator & 3 port hub