Why ten years in particular? There actually aren't that many ten year old bourbons (there are older and younger, but for some reason, not that many ten), but there are a few. The last two editions of Parker's Heritage Collection (an annual release that is different every year) are both ten years old (the 2010 is a wheated bourbon and the 2011 is finished in Cognac casks). These would both make excellent gifts and will likely run you $70-$80.
If you want something cheaper, Eagle Rare Single Barrel is a very good 10 year old that is more in the $25 range and is pretty easy to find.