Isabel Marant's gorgeous bow embellished Poppy pumps have been worn by a ton of celebrities including Hilary Duff and Anne Hathaway.
Although these pumps aren't suede and have a lower heel, these pumps have a very similar bow detail and retail for $396.50 less than the original (although still may be a tad pricey for some on a very strict budget). They are by Elie Tahari, retail for $223.50 on sale and you can click on the photo below to purchase!
Note: A reader also mentioned in the comments that Shoe Dazzle has a very similar shoe to the red Isabel Marant version at Shoe Dazzle (you must sign up to purchase and I'm not a member but you can click HERE to see the shoe) for $39.95.
*Update - 7/1/11* - Colin Stuart now has a version of these bow pumps (with removable bow) in black, red, or leopard print. Click on the image below if you're interested in purchasing - they retail for $58 in the solid, $68 for the leopard print.