Technically you don't not need to go through TLS nor do you need to pay anyone for the visa. You are eligible to apply directly to the embassy provided you will be travelling together.
If you decide to apply via TLS then that's your choice and you will need to stump up for any fees/charges etc.
Any Embassy/Consulate that try tricking people into paying an agency for a COMPULSORILY FREE schengen visa for the spouse of an EU citizen is technically
breaking EU law, if that spouse is travelling with an EU citizen.
The latest harmonised form is here
Look for the questions marked "*" and read the notes at the bottom of page 1