The posts that base the worth of the trade on the monetary value alone are bogus. As stated by the wise above, prices in your state are the prices in your state. Beyond that, the idea that the quality of each arm is reflected in the price is also bogus. I have both, and used Sigs in new condition routinely rotate locally for just less than the price of a new CZ 97B. Is that because the CZ is low quality? No. The CZ 97B, in my opinion, is under-priced. I have a gloss 97B and am astonished that it is not an $700+ piece. The accuracy is astounding, the trigger is smooth as butter, and the gloss finish is deep and handsome, the takedown is as easy as the Sig. At the range, people say the Sig is a 'good gun'. But the compliments are come in for the CZ.
Yes, one can CCW the Sig more easily, but will you?
Shoot both guns and if you are impressed by the 97B, and it suits your purposes, trade. If there is ever a collector's market, the CZ will appreciate more than the Sig. Please, stop insulting the CZs. The quality is THERE.