Tamim is beauty commerce writer at InStyle, with nearly a decade of experience writing about beauty, fashion, wellness, and music.

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I first waxed poetic on Ourself's Subtopical Lip Filler in June, a month after I started using the "subtopical" plumping treatment. The color of my lips improved from what I thought was their permanently-uneven and murky hue, and my top lip was drastically fuller.

I've remained dedicated to a minimum twice-daily application of Lip Filler since then, and have subsequently gone through five refillable tubes of the product. After noticing the improvement in my lips, my sister bought a tube for herself and has since become a fan with similarly great and visible results. The one caveat, however, is that the stuff is expensive — $145 for the starter Lip Filler kit that comes with the pen and two vials, and $100 for a two-pack refill of the treatment. But if you're not ready to shell out that kind of cash, you're in luck: Right now, the brand is having its first-ever sale since its launch.

From now until September 5, everything on Ourself is 20 percent off. While their proprietary at-home chemical peel and moisturizers are worth a gander, I strongly recommend finally trying, or stocking up on, the Lip Filler quickly; It once sold out of its yearly inventory in just two months, even at full price.

Shop now: $116 (Originally $145); ourself.com

If you're thinking about other popular plumping products that are a fraction of the price, let me explain the difference. A typical lip plumper is a short-term, instantaneous product — you feel the tingling, your lips swell up for an hour or two, but ultimately return to their baseline.

Lip Filler, on the other hand, is a long-term treatment that's more akin to something in your skincare routine. It takes repeated and regular use to see a difference, but the benefits are semipermanent. The plumping product uses encapsulated hyaluronic acid molecules to penetrate deeper into the skin, which Ourself calls its Intide and ″subtopical″ technology.

I notice that my lips look a little deflated if I stray from my Ourself routine for more than a couple of days, so I plan on continuing usage religiously to improve my pout, which I think is really demonstrated by the photo below.

Head to Ourself to try Lip Filler, or to stock up on Lip Filler Refills while they're in stock and on sale.

Shop now: $80 (Originally $100); ourself.com

The Lip Plumping and Enhancing Regimen

Shop now: $152 (Originally $190); ourself.com