With no Autozone nearby and all the constant problems... maybe it would be a good choice to invest in the Scan Gauge tool. It will allow you to view the codes yourself, reset check engine light, and view other performance data. At about $120, it's not cheap, but after 1 or 2 times of paying to have someone else read the codes... you break even.

I realize that spending more $ on this problem may not be your desire... but maybe keeping a log of all this, as well as having frequent access to the codes can help convince your dealer that your HCH is sick...

Here's the info, if you haven't heard of the Scan Gauge:
http://www.scangauge.com/

btw, they plan to release a new, improved version later this month that is specifically for hybrids (the current version works with the hybrids, but this offers improvements).

Good Luck!