Best Buy via eBay offers the Blue Snowball iCE USB Microphone in White for $39.99 with free shipping. That's the lowest price we could find by $10, although we saw it for $10 less in December. (Still, it's a strong no-rebate price for this mic.) It features a custom cardioid condenser capsule, 40Hz to 18kHz frequency response, and adjustable desktop stand. Deal ends May 29.
Of note, Amazon offers it for the same price.