You can buy Stellar USDC with cash through MoneyGram.
To buy USDC with cash:
Sign into your Vibrant account
Tap the + button (Add)
Select Cash drop-off
Tap on Next
Enter your cash in amount
Select your cash in Country and State
Select a payment location
Please review your transaction details
Fill out your information
Fill out your identification details
Please review and submit your transaction summary
Process your payment at your nearest MoneyGram location with your reference number and Photo ID.
The value will be added to the wallet in USDC.
After creating your order, you have 24 hours to pay for your order.
Please note that this is currently only available for US and ARG users.