I have a Buck model 110 that I have been carrying since 1982. I bought it when I got out of basic training. This knife has been all over the world with me and is like a trusted friend. I have never owned or used a knife that keeps an edge like this one does, and I use it for everything. These knives are still available and I recommend one to anyone who has a need for a knife.

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Hope for the best, but plan for the worst.

NRA Certified Instructor for Basic Handgun and Personal protection in the Home.
V.F.W. Life Member
NRA Member
U.S. Army Veteran

If you are looking for a good multi purpose locking folder, check out the Victorinox , Hunter model.

It has a locking main blade, a large saw blade, a smal serrated blade, bottle/can opener/small

straight slot screw, phillips screwdriver and the usual toothpick and tweezers.

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Retired Navy SERE (Survival, Evasion, Resistance, Escape) Instructor
certified pistol, rifle, shotgun, home defense Instructor
NRA Life Member
Survival & Disaster Preparedness Instructor

Not sure if it's out of your price range or not, but the Benchmade mini griptilian is a fantastic folder.

Benchmade knives combine distinctive artisan quality of a custom blade with laser precision to create spacing tolerances as low as .0005", less than 1/16th the thickness of a human hair. The patented AXIS™ mechanism of the Griptillian locks the blade in place with incomparable smoothness and unsurpassed stability. Omega-style springs on both sides of the handle secure the locking bar to prevent accidental closing. The D2 Tool steel blade hardened to 57-60 Rockwell holds a razor-like edge and is treated with a BK1® coating to prevent rust and corrosion. And for a solid grip in wet or dry conditions alike, the palm-contoured handle has a swelled base and molded texture for slip resistance. An Ambidextrous thumb stud facilitates fast, one-handed opening. It also has a reversible steel carry clip.

Blade length: 3.45".
Closed length: 4.62".
Weight: 3.25 ounces.
Colors: Black, Olive.
Available: Plain or Semi-serrated.

I think I got mine from Cabelas. They're selling them now for $89.

http://www.cabelas.com/cabelas/en/templates/product/standard-item.jsp?_DARGS=/cabelas/en/common/catalog/item-link.jsp_A&_DAV=MainCatcat602941-cat602943&id=0022073516109a&navCount=2&podId=0022073&parentId=&masterpathid=&navAction=push&catalogCode=9IS&rid=&parentType=&indexId=cat602943&hasJS=true

I've had pretty good luck with my Kershaw 1550ST Blackout from Walmart. It's a nice knife that has a "Speed-Safe" torsion bar mechanism that can deploy the blade in an instant.

http://www.associatedcontent.com/article/5984704/knife_review_kershaw_1550_st_blackout.html?cat=15

It's also nice to buy a product that is made in America!

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Vanquish Fear and Panic!
www.thegundude.com

Also, be aware some areas in the country have laws against carry knives that can be considered switch blades.