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Given a travel related situation, and given a specific question about the situation, summarize the question into a title

My wife and I are going to Las Vegas on a business trip for 5 days. While we're there, we want to be able to keep in touch with mobile phones, and I'd like to spend about $10-20 per phone (including prepaid credit).

This is possible in the UK, where one can buy a Pay As You Go phone for less than 5 and a SIM Card with 10 credit on it. Sometimes you can get them bundled together for 10. That's the kind of price range I'm looking at.

A while ago when I went to Wyoming, a friend advised me to buy a prepaid Tracfone, but that worked out to cost more than $50.

What's the trick to getting cheap temporary phones in the USA?

Output:
How can I buy a pair of cheap phones in the USA