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If you have BB and CC close together, you could get two of these (one from BB, one from CC) and use two rebates on your name. The rebates go to these places:
CIRCUIT CITY
Dept. 31985
CC RIO600, $50 MIR
P.O. Box 52900
Phoenix AZ 85072
BEST BUY
SonicBlue
Dept 31983, Rio 600 32MB
P.O Box 52900
Phoenix, AZ 85072
They are IDENTICAL except a slightly different department number, but I believe this should fly with the rebate companies. Good luck, I think I'll get two myself 
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You can't PM with BB because it's not advertised. Check this out from CC's webpage about their low price guarantee:
"For every product we sell, we'll match any
advertised price from a local store stocking the same new item, available for sale with a manufacturer's warranty and in a factory-sealed box. Even after your purchase, if you find a lower advertised price within 30 days, including our own sale prices, we'll refund the difference.
In order to take advantage of our Low Price Guarantee, you must visit your nearest Circuit City store, as we do not provide on-line price matches.
Our Low Price Guarantee does not apply when the price includes bonus or free offers, special financing, installation or rebate, or to one-of-a-kind or other limited offers or against a competitor's tagged price that is not in an advertisement. For cellular phones and pagers, our Low Price Guarantee applies to hardware only, provided that the competitor's service provider, service plans, terms and conditions are the same."
Note that "advertised" is bolded here and on the website as well.
Note the part that says "Our Low Price Guarantee does not apply... against a competitor's tagged price that is not in an advertisement."
No you can't find a stupid employee because it is up to the manager, the CC reps usually go to a manager first before they do a pricematch. So YMMV. Unless you get a kind and/or stupid manager. They even went to a manager when I tried to pricematch those TDK cdrs with Target...
Maybe worth a try but don't count on it.