Also, Google Business listings.

So many shops can increase their sales revenue and branding by showing up on Google's Map. But most shop owners don't even know they should be doing that, or don't have the time or interest to do so.

There's ZERO capital required to create a listing on behalf of the shop, (given that you have permission to claim the listing or create one on their behalf.

Figure out the description, store location, hours, etc, and take some pics -- voila, a professional business listing for the shop. Sure, in the beginning without a portfolio of other shops to use for reference / testimonials, it might involve doing some freebies (everyone has a shop keep they are buddies with ... start there, until you have a small portfolio, then only service those willing to pay).