Most shops will have something like a 700x35-45 tubes that work great in a 700x50 and cost much less than a "29'er" tube. I'm brand-agnostic. I usually use Kenda or QBP brand tubes, which are cheap and seem fine to me. I'm not sure what Schwalbe tubes offer to justify the higher price and generally sparse availability (I have a wholesale account with Schwalbe, but still).
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