Low voltage (and small) audiophile caps

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I'd like to build a PIMETA headphone amp, and have decided on all parts except for the input caps (two .22uf). I'm willing to invest in some pretty good caps for this, but I'm having a hard time finding "audiophile" caps in a non-wasteful voltage range--they only really need to be rated at 35v for the amp I'm building.

PartsConnexion has some 250v Mundorf tin foils for $8 each (do-able), but the .22s are about 1.25 inches long. That's actually not too big, it could be made to work in the enclosure I'm using, but I'm just wondering if there's a high-quality cap available that's smaller in size and voltage (high quality as in better than the standard cheap Panasonic/Orange Drop type).
 
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