If you don't mind buying one at a time, you can still use this printable coupon for 20% off one figure at TRU. Expires 10/26 (Saturday).
They're overpriced on all of their figures, though, so don't expect an actual 20% discount. It brings Swappables down to $13.60 and regular figures down to $8.80.
Also: Definitely check out Craigslist. I see all kinds of great deals on figures from the first two games, usually never more than $5 each when buying a bundle.