Mora has a host of options, for $30 you could get 2 and still maybe have some change.
And just in case you haven't got em yet, Cold Steel Kobun tanto, Bushman lineup, and their new Peace Maker 2 can all be found under $30, or you could get any 2 of their Canadian Belt Knife, Pendleton Lite Hunter, Finn Bear, Peace Maker 3, and/or Roach Belly for under $30 total...could maybe even swing 3 of them if you didn't mind buying used. They also have a lot of "neck knives" for under $30, the Mini-Tac line, Secret Edge, Hide Out, Best Pal series, Super Edge, etc.
Imacasa and Tramontina Machetes are cheap, $30 should get you at least 2 of those...they might be a bit bigger than what you're looking for though.
In case you don't have them yet, the Condor Rodan, Bushlore, Bushcraft Basic, Bolo machete, Eco-Survivor machete, and their various neck knives(Windfang, Tangara, etc) can all be had for under $30. Right now at Knifecenter you can also find the blue handled version of the Condor "Mountain Knife" for $20(for the 12'' blade) or $15(for the 8'' blade), normally they run around $35.
If you check out SMKW, they sell Marbles machetes really cheap, between $13-20. They're ugly as all hell with that orange coating, but they're actually made by Imacasa so they're good blades.