If you take the time to re-read it why not just take the time to write it yourself? Hell for this specific application, I'd bash out a PHP script that takes the services needed, clients info, whatnot as arguments, and just spits out a pre-formatted quote letter. Like yeah every one will look the same but your prospective clients aren't comparing their letters to see if you're automating that process, they don't care.
This is also automating that process but injecting the possibility of errors for literally no reason.
I reread my own important emails that I wrote myself to spot mistakes.