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Alright seriously? I can't just pay the $5?
Why the fuck. Urgh. I hate this tiered crap.
PROTIP: Found it. Make sure to select "needed funds" to add the exact amount, instead of buying $10 worth.
Click purchase > add funds > Add funds with Credit Card > Needed funds.
Clicking "Add funds" at the first menu will not allow you to click Needed Funds.