cheap mics= crap.
You wan't to hire if you can't justify buying decent mics.
I use Sennheiser EW112's. Not cheap, but not the most expensive. Have mini-jack or XLR connect to camera. Compact head. Good SNR etc.
Wireless mics may not be the best thing for the job. More often than not I close mic with a rifle mic on a stand.
Again, good mics aren't cheap. I use a sennheiser K6-ME66 combo, and also a Rode NTG-2, the Rode is excellent for the money. Both these mics are better used with XLR connects, either into a beachtek or juicedlink, or as some prefer, into a zoom or tascam.
Cameras offer great results for the cash and decent audio gear often seems very expensive in comparison, but 99% of picture problems can be solved with software, poor audio will always mean a poor production: you should notice great pictures, if the audio is good then you won't notice it, which is what you want.
Audio will always betray a lack of production values.
Sorry to bang on and on, but you get the drift. You don't need deep pockets, just a clue about what you are doing and a local hire shop. Don't buy the azdens. Absolute false economy.