I use Etsy on Sale and I love it.
With Etsy on Sale, you can out your entire store or just a section "on sale"
It is rather inexpensive and can drive sales.
I am currently running a "March Madness Sale"
I have the title of the sale in my descriptions.
You can try it out. they give you 5 credits and I think it only costs 4 to run a sale.
If you subscribe through this link, you get 10 credits because I referred you.
Check it out or convo me for any further questions.
http://www.etsyonsale.com/sellers?referralCode=TWY5HFNN9J