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It's not uncommon for an older home to settle a little bit and cause cracks in plaster. The home I bought had a corner that had an issue. I'd be upset if it were a 10 year old home.
You can buy floor jacks at any of the big stores(home depot, lowes) and probably at most of the local hardware stores. I bought 4 last year and I think they were about $75 each.
If he jacks the house up too much, it will cause more cracking. If it were mine, I'd put a level on the floor above it, find the corner with the issue and do it myself.
I wouldn't put the jack on one floor joist....I'd put a 2x6 across 3 or so and center the jack on that near the edge. Get it tight and then give it a few turns. If needed, I might add another one back into the room a little also(assuming unfinished basement). Then every week or so, go down and give it a few turns until you're closer to level. Then fix the cracks and move on.
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