Do you mean how much can you get a Sentra of that year for? That is a '98 Sentra SE and should run you anywhere from 4k to 6k. The 99 SE also came with the Sr20de if you are interested.
Not that it is the ultimate source of car pricing, but KBB lists a '98 SE for $5,500 (private party, not stealership) in my zip code. The Black Book shows 4k for "Rough" and $7,350 for "Extra Clean".