I recently purchased a box of 10 Mercury detection badges, and only need half of them. So I would like to sell half of the box. I paid $134 for the box, and would be happy to sell half of them (five single-use badges) for US$60 plus shipping. Note however, these badges need to be refrigerated, so they would have to be sent to you via a one-day delivery service, packed with ice-packs, so figure that the extra shipping will run $25, which is what I paid to have them delivered to me.
Of course, you can also swing by and pick them up in Portland Oregon.
http://www.labsafety.com/chromair-colorimetric-badges-mercury_s_26756/?searchterm=mercury%2bbadge
http://www.morphtec.com/html/chromair.html
Please note that these aren’t the absolute best Hg detection method, as the threshold is fairly high. The manufacture claims that the minimum detectable limit is 0.02mg/m3 over eight hours. However these do serve as a good first alert to see if your mercury fumes are being cycled back into your lab or somehow leaking, and they don’t require the investment of hundreds of dollars plus lab fees. While a smoke bomb is the best form of detection for leaks, it can’t tell you if mercury is building up in your studio.