Lumens are available at every major cryptocurrency exchange. ¹
Some of the top exchanges that list lumens (XLM).
Stellar DEX UIs
User interfaces for the Stellar decentralized exchange that have enabled USD deposits.
CoinMarketCap maintains an independent list of exchanges that list lumens.
¹ Before purchasing lumens, you should be educated on the risks of buying and holding cryptocurrencies. Please consult this on the potential risks associated with digital currencies. Note that while lumens will always have utility in the Stellar network, the price of lumens denominated in fiat currency may be volatile and could lose significant value.