MS-300M Tax and Currency Calculator, CSOMS300M

Large, easy-to-read three-line eight-digit display. Currency conversion mode and time calculation... Buy it:
$11.98 at Business-Supply
Ativa AT-10 Financial Calculator, Silver/Blue

The AT-10 offers several easy-to-use functions. Includes tax +/-, cost/sell/margin, currency conv... Buy it:
$19.99 at Office Depot