A best bet is the Portal 2 Miniature Replica Portal Gun (pictured) for $59.99 before the above coupon, $46.58 after. With $7.04 for shipping, that's $4 under our October mention and the lowest total price we've seen. Although it (probably) doesn't actually warp reality, it does feature orange and blue LED lights, play sounds from the game when fired, and include a display stand. It requires three AA batteries, not included.
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ThinkGeek takes 20% off sitewide via coupon code "BLUERUPEE". That's the best percent-off discount we've seen from ThinkGeek. Shipping starts at $5.95, or get free shipping on orders of $75 or more. Deal ends February 21.
Shipping: Free Shipping