I have no clue if this is just a local Best Buy thing or if it's national, but when I ran over to my local BB (it is in 45426 zip code) they had 2 of the XFX Radeon 4890s on clearance for $125.99. I snagged both but ended up taking one back because my mobo & power supplies would both need upgraded to handle the cards.
Fantastic deal on the card, IMO.
I'm having a hard time finding much in the way of reviews for the XFX 4890. Not sure why, but the few I've seen have been comparing it roughly to the 5850, just doesn't have the 3 monitor support & DX11 support.. but for 1/2 the price, still an incredible deal, if you can find one.
Sorry I'm short on details. @ Work now, will try to find the SKU/UPC when I get home if anyone needs that info.. it doesn't look like the thing is showing up on BB's website right now anyhow, as I've been unsuccessful @ finding it.
Good luck =)
Link to Newegg's page for the card here