Giant Sequoias have a limited range they will grow in. You should probably look there for your land.

I own land in Trinity Pines Sub-Division. http://www.listingpreview.com/results.htm here are some listings. I have several redwoods growing on my property that were already there when I purchased it. If they grow there naturally, you should have no problem planting them. My land was $33,500 for 2.42 acres with water. It's about 2 hours from the coast (Eureka, CA).

I don't think you are going to find cheap land in any area where Sequoia will grow.

The trees themselves, though, can be bought very inexpensively from university or state reforestation programs.

If you want forest land, this is a good time to buy, while lumber prices are in the pits.

I did have sequoias doing well in the Oregon Coastal Range, further north than their normal range. But again, not cheap land.

I've heard that forest land in Maine can be had for $800 an acre. I don't think Sequoia will grow there, but maybe you could learn to love some other kind of tree?

One other thing to consider. Forest is often zoned for forest and you might not be allowed to build on it.

In Oregon, you must have 120 acres of forest land (or maybe it is 160 acres) before you can get a permit to built on forest zoned land.