Any idea where to get legit A+ vouchers

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I found out 2 places for booking exams: Vue & Prometric!
to a test centre.

But while reading the book at the end, I found out vouchers saves some money!

I found one of the site on google!
CompTIA International A+ Essentials Vouchers - Prometric / VUE Exam International A+ Essentials Voucher Test Discount
Above links asks for paypal!

Is there any places where I can voucher for both exams?

Thank you