That’s a great idea. 
If you reply to one of the DotD/Special Offer posts, and then press the speech bubble icon on the far left of your format bar, it will quote the post in your reply window (including all the code). Remove the [quote] stuff from the top and bottom and you’ll have a template you can work with. 
I copy paste it every day, and just swop in the new image, links, price, etc.
And if you need a hand you can have a practice in the Sandbox, and we’ll help you out.