Recorder, probably $75 - $150 per day. Mixer, $25 - $55 per day. Wireless mics, $55 - $125 per day, depending on the quality of the packs and the type of mic you get. It also depends on how long you're renting. Most rental houses will do 3 day weeks or give cheaper weekend rentals since it is not a peak rental time. It can really vary a lot depending on location, time, etc. Always shop around though.
I would recommend looking for a sound person that already has these items. It will probably end up being cheaper to pay him or her a day rate including equipment than to rent the equipment you listed.
Location Sound is good, as birdhousesound said. I also like the guys at Coffey Sound. If you're on the east coast or southeast, I can also recommend some rental locations.