Repeating my dirty under $30 list - will never stop supporting these dudes, you do not have to support brands in Communist countries or buy bad quality to have a good budget knife. Every time these threads come up people go crazy with Chinese knives.
RAT 1/2 (Taiwan, usually in the $27-30so range depending on steel)
GRIK (Taiwan, got mine for $30)
Buck 110 Slim Select ($27 on sale, even can dye the scales, great great knife, USA made)
Otter-Messer K55 Mercator (German made, classic timeless design, 1867, looks great, less than $20 sometimes)
Douk-Douk (French, comes in various versions, carbon or 14c28n)
Opinel (These can be had for like ten bucks sometimes, no. 6es, they come in Inox or C75)
M.A.M (Brazillian brand that has been around as long as Opinel, the Opinel of South America)
Higonokami (Old school Japanese knives, comes in all different kinds of steels, from VG-10 to SK to Shirogami to Blue Paper....)
Mora (Sweden, carbon or stainless, robust and tough, I would go in the woods and have a Mora be my only knife any day of the week)
Ontario SP series (USA made, guess already covered under RAT, but these are great KA-BAR or Becker alternatives, quite cheap, full tang, 1075 built)
There are lots of small Spydercos like the K390 Wharncliffe Dragonfly or the Cricket that are GREAT cutters and cheap.