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When I got mine a couple months ago the best I could find was just around $40 before s/h ($40.54 to be exact). Now the ET-7s go for around $30? I'd bet if someone offered $20-$25 he'd probably take it, maybe.
The only one I see on Amazon.com is $49.99 before s/h.
I got mine off of craigs list. I had added them to my cart some time ago but never bought it. I got an e-mail that the price was reduced to 34.00 so i bought two.