As you want to buy online used SMI DCE Data collection Enhanced Surveying Software Card for HP 48GX Calculator, so its prices is US $325.00 :

Item specificsCondition: Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully ... Read moreabout the condition Brand: SMI
MPN: BC- 114175 Model: 48 DCE

fully functional SMI DCE Data collection Enhanced Surveying Software Card
for HP 48GX Calculator, S/N 114175. Overlay is Included.
The card was tested and works as it should.
Guaranteed in working condition.
Free domestic shipping with USPS tracking number.
Global Shipping Program takes care of international charges.

Items are usually shipped same day of purchase.

INSTALLATION INSTRUCTIONS OF THE SMI 48 BCE CARD.
You need a RAM card 256K or over in port 2

press: alpha, letter K (Up arrow key) Enter and software is ready to use.