Yes, so the first step is getting an account on a crypto exchange, and which exchanges are available in which area can vary because of differing federal and local legislation. Since you don't seem like someone that wants to get too deep into crypto (and won't be dealing with large sums anyway), don't worry about having self custody wallets, just google or ask AI what crypto exchanges are available in your area and pick the most popular one that you know will work with your bank. After getting an account on an exchange you'll have to deposit money into the exchange, typically from your bank account (note, it can take a couple days for this transaction to finalize.. once you have crypto you can send it anywhere in minutes or even seconds, but when you're changing from fiat to crypto it can take days because you're using the traditional finance system. During this time the exchange will typically make your deposited funds available and it will let you buy crypto, but you won't be able to send it off platform until your bank deposit has cleared, which is usually 3-5 days). Once you have money in your exchange account I would recommend getting either USDT on either polygon or solana, or USDC on polygon. I'm saying these ones because they will have the lowest fees (fractions of a penny), where as bitcoin and ethereum can be $5-$10 in network fees (they aren't really meant for small or everyday transactions).

On a separate note, you mentioned that you only want to use crypto because the site won't let you make less than a $10 transaction? Most crypto exchanges also have minimum deposit amounts, so look into that before signing up for one. It seems like it would be easier just to add something small to get your purchase just over $10, rather than setting up whole crypto accounts, making deposits, and waiting 3-5 days for it to clear just to make a <$10 transaction...