...and when I try to go through with it, slaps me with a 5 mBTC additional fee.
Sounds like you've set up a 2FA wallet... and ignored all the warnings and information about how you have to PAY for the 2FA service:
https://api.trustedcoin.com/#/electrum-helpYour choices are either click the little blue shield in the bottom right corner and select the cheapest option available (if you want to retain 2FA functionality)... OR you can simply restore your wallet from Seed... and select "Disable" when prompted if you want to "keep or disable" the 2FA functionality.
This will put 2 of the 3 private keys in your wallet, and you'll be able to send transactions without using TrustedCoin (ie. NO 2FA)... but you won't have to prepay for the 2FA functionality.