I will second that (i have 50ish Vics!).Victorinox makes a good inexpensive knife. And they do have a locking folder option.
For two layers A good old Spartan, Recruit, Compact or Alox Soldier or Cadet series.
If you want three or more layers try an Alox Farmer or a Huntsman.
You can get great prices on used vics on ebay.
Its not problem to get a Hunstman for 10$ or so.
The Vic locking blades will run you at least 20+ dollars though.
The Rucksack, Outrider and OH Trekker are great knives!