If you are a registered user (teacher or student) of Achieve Music and you have a discount coupon code from Achieve Music then you can use it here to buy a single Transcribe! license at a 20% discount.
You can evaluate Transcribe! for a 30 day trial period before deciding whether to buy: download it here.
If you do decide to buy then you will receive a license key by email which you enter into the program to remove the 30 day restriction.