A functioning Twitter account and instructions on how to use it. Technologists (you, me, others here) GREATLY overestimate the technical capability of the other adults around us. If a small business does NOT have a Twitter account then it's a safe bet that they either don't have company email or don't know how to set it up. A well written profile, header and profile picture, and an explanation of hashtags and how to post is worth $50 to $100 in a lot of cases.
Maybe banners, artwork, bio, follow relevant accounts, make some starter tweets with popular hashtags to get some follows back, interaction with some key people. I wouldn’t pay for it personally but someone might.