Evap Code

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Went to Autozone today to diagnose the dash lights that came on again (Check Engine, Trac Off, VSC Light). Printout Code P0446 stated - Evaporative Emission Control System Vent Control Circuit Fault. Probable Cause: (1) Open or Short Circuit condition; (2) Poor Electrical Connection or (3) Faulty CCV Vent Control Solenoid. This happened a couple of weeks ago after I filled up the tank with gas. Took it to Autozone back then, they said "Evap Code", tightened the gas cap, reset the codes, lights off -- no problem. Okay for a couple of weeks. Went to fill up tank yesterday, no problem. No warning dash lights. Started up car this morning after sitting all night -- no warning lights on dash. Went to do errands today and upon making a rather sharp turn (oops), heard a little buzzing noise, then same 3 dash lights lit up. Took it back to Autozone to diagnose lights (see paragraph 1). Guy said it could be the faulty CCV vent control solenoid (which he did not stock). Said part should cost about $40 and labor to put it in (about an hour), so shouldn't cost me more than $150 to repair this. Does this sound reasonable? Absolutely will NOT take this to local Toyota dealership -- always, always, always outrageous for repairs! Autozone guy said I can drive car safely. My annual inspection does not come up until the end of January 2015. Should I bite the bullet and take this to my local mechanic now and hope it's only approx. $150? Any thoughts?