The scanner itself does not expire, the hyperspace coordinates it can produce do expire. Depending on which model you have they expire 7 days or 30 days after they are taken.
My apologizies, but I do not understand your second question.
Current jump drive technology is only usable by battlecruiser and above class craft. This is due to the immense power draw jump drives require.
We do not typically stock jump drives, scanners or cloaking devices as they tend to sale as quickly as we can produce them. If you're wanting a light cloaking device, we can begin construction within 24 hours and once complete you can purchase it for 225 million credits on Nichols.