Round Pixel
Round Pixel provides this nice Valentine design and a series of hearts that can be used for commercial or personal use. A link back is requested, and don’t try to claim them as your own.

henocbeseleel (Vecteezy)
AI file. License: Attribution (Creative Commons).

Dr-Depot
AI file. License: Creative Commons Attribution-Share Alike 3.0 License.

Turbo Squid
A basic heart in AI format. Requires registration to download.

Scranton Label, Inc.
Scranton Label has a bunch of eps/pdf shapes intended for use as diecut stickers, including a nice dotted line heart shape.

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