Substitute for sesame oil? An Asian recipe I'm trying calls for sesame oil. However, the only bottle I found is $6, and since I'm only using a tablespoon of it, and am on a tight budget, I don't want to spend that much just to not use most of it. Is there a good substitute for the sesame oil? 

The recipe I'm making is a "cheater" Korean beef dish if that helps at all.

Update: I tried it with extra virgin olive oil instead and it turned out fantastic! I'm not sure how much different it would have been with the sesame oil, but it was pretty great without it. The recipe can be found here.
Since your recipe only calls for a tablespoon, I am inferring this is toasted sesame oil, which is used for its strong and lovely flavor.

There really are no good substitutes for this purpose.

I would recommend investing in the bottle, which kept in the refrigerator should last a long time, and will bring flavor to many dishes.  

If you choose not to do that, I would simply omit the sesame oil, although your dish will lack certain depth and complexity the oil brings.