Yes, this is why the money is in the list folks. Here's the tip:
Just run a limited time Labor Day Sale.
Lower the price of your product and throw in a few 'act fast' bonuses. Make it a four day sale which ends on Labor Day (or something like that).
Make sure you exclude recent customers from the communication and make sure you give them a valid reason for the sale which they'll understand. It could be a "Labor Day Subscriber Appreciation Sale" - as long as there is a real reason.
Hey, Macy's has a sale like every other week why can't you? People love sales and don't want to miss out.
Even if you don't have a product:
Contact a product owner and tell them you're an affiliate with a list. Tell them you want to run a special and need a coupon code or a link for a discount price to offer your subscribers. If they foolishly say no, contact someone else.
Again, throw in a few bonuses to give them after they get the special offer. Make them a deal that they don't want to miss out on.
You can also ask the product owner for some product reviews and reference them in your emails.
This will work even if you have a small list.
Then come back and post your results after the sale :-).