There are over 10,000 Coinstar kiosks in the U.S. where cash can be deposited for a voucher, and that voucher then redeemed on CoinMe for purchase of bitcoin.

However, the fees to do so are relatively high. There's a 7% "cash exchange fee" as well as a 4% "transaction fee". Additionally, there's a "network fee" which is for the on-chain withdrawal transaction.

As a result, users have been asking CoinMe to support Lightning network so that withdrawals would come with only the trivially small fee incurred when using Lightning network. For example:

Instead of CoinMe serving their bitcoin userbase with the addition of Lightning network support, they instead spent their time adding support for shitcoins! Announced today was support for Dogecoin, Litecoin, ETH and a handful of other shitcoins that nobody gives a rat's ass about.

Anyway, ... back when Coinstar+CoinMe first came out with these Coinstar vouchers, there were fewer other options to buy bitcoin so this was as the time seen as being a big deal. Today, however, there are very many methods to buy bitcoin, and a number of these other methods have support for Lighting network. So there's very little reason to stuff cash into a CoinStar machine to buy bitcoin anymore.