This is interesting. There are two of these currently being offered on Ebay. I've never seen this image offered for sale (except for one that was foamcored and the seller kept re-listing the auction at lower and lower prices) and now there are two at the same time.
Flaming Lips Poster 1994 Metro Orig Silkscreen - eBay (item 180318434921 end time Feb-03-09 12:58:31 PST)
Flaming Lips ORIGINAL/silk-screened poster Metro Chcago - eBay (item 200300216968 end time Jan-24-09 21:39:25 PST)
I have no affiliation with these sales, but to those thinking about buying one, you won't be disappointed. It's a great print in person.
And for those of you thinking that I'm being a cheerleader, well, nothing could be worse for the value of my print than to have supply exceed demand. I just find it an interesting occurrence that two are up.