"The Kenny Rogers t-shirt is a replica of an old ’70s tour t-shirt that was sold in Wal-Mart and other stores. Vince Gilligan bought the t-shirts at a Wal-Mart outside Taos thinking that it might be a good shirt for Jesse, but it ended up working better for these scenes. If you want to pick up one, the t-shirts can occasionally be found on eBay, as they are no longer in production."
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So... it's probably very rare to find that exact same shirt.
There's another link that talks about it, too.
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Sorry, I looked because I wanted to see if I could find one, but I couldn't. I'm sure if you keep your eyes peeled, though, you'll eventually find one someday! Don't give up just yet!
