A look at what is currently available on eBay
 SMI 512k RAM CARD HP 48GX 48 GX HP48GX 512ko 512 k ko US $169.00 
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 SMI Advanced COGO survey card.HP 48. US $124.95
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 SMI DCE V7 Survey Card with HP48 GX US $350.00
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 HP 32k RAM CARD HP 48GX 48 GX HP48GX 32ko 32 k ko SMI TDS US $39.00
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 HP HEWLETT PACKARD SMI GLOSS PHOTO PAPER ROLL Q6580A US $104.95
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 SMI SCE Enhanced Surveying Card for HP 48GX Calculator US $389.00
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 HP 48GX CALCULATOR SMI * SOFT BELT CASE * 48 SERIES US $9.99
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Items recently purchased from this site
SMI 512k RAM CARD HP 48GX 48 GX HP48GX 512ko 512 k ko, SMI Advanced COGO survey card.HP 48., SMI DCE V7 Survey Card with HP48 GX, SMI 1MB RAM Card for HP 48GX Calculator (Battery Included), HP HEWLETT PACKARD SMI GLOSS PHOTO PAPER ROLL Q6581A, SMI 1MB RAM CARD HP 48GX 48 GX TDS HP48GX 1MO 1 MB MO MEGA, HP 32k RAM CARD HP 48GX 48 GX HP48GX 32ko 32 k ko SMI TDS, HP HEWLETT PACKARD SMI GLOSS PHOTO PAPER ROLL Q6580A, SMI SCE Enhanced Surveying Card for HP 48GX Calculator, SMI DCE Data Collection Card for HP 48GX Calculator , SMI Hard Environmental Case for HP 48GX Calculator, HP48GX-SMI-SCE/CE CARD,SMI OVERLAY,256 RAM SMI USERS GUIDE,TRAINING VIDEO, HP 48GX CALCULATOR SMI * SOFT BELT CASE * 48 SERIES,