Since you're in the USA, I'd recommend looking at a used Global Specialties FG. For these reasons:
They are often used in trade schools, and built like tanks
It was first designed in the 1980s, and still made nearly unchanged, to this day
The 1980-1999 ones are dirt cheap and made when ICs were made with higher quality than today; they last "forever"
The older models are made in Taiwan, who overall, still do better QC than PRC devices
They are easy to repair, if ever need be
typically sold used for $20-$50,
S&H includedCons
These are analog FG, and have higher distortion and frequency instability typical of analog frequency generation
http://www.ebay.com/itm/GLOBAL-SPECIALTIES-2001A-FUNCTION-GENERATOR-SINE-SQ-TRI-200-KHZ/231002423522?rt=nc&_trksid=p2047675.m1851&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D261%26meid%3D8629273829926417366%26pid%3D100005%26prg%3D1088%26rk%3D2%26sd%3D121123993969%26http://www.ebay.com/itm/GLOBAL-SPECIALTIES-2002-FUNCTION-GENERATOR/121123993969?_trksid=p2045573.m2102&_trkparms=aid%3D555003%26algo%3DPW.CAT%26ao%3D2%26asc%3D277%26meid%3D8629254251381961189%26pid%3D100034%26prg%3D1079%26rk%3D1%26sd%3D390565912871%26http://globalspecialties.com/test-equipment/generators.htmlIf you need a new one, general purpose, I still highly recommend the GW Instek SFG-1003, I use it very often.
Its output frequency is ppm stable, low distortion down to ~ -50dB. Not "audiophile" quality, but that's a whole other issue
Cons
No sweep or modulation
No voltage controlled oscillator
http://www.tequipment.net/InstekSFG-1003.html$145 sale price, $5 cheaper than when I paid list for it at $150