Hi  Donovan, there are lots of ways to advertise on a limited budget.  It looks like you offer soaps at farmers markets, but would like to increase sales to include more regular online sales.

1) Some ideas to maximize your farmers market sales would be to test letting people know that each month you will be offering a free product bundle to someone.  All they have to pay is S/H.  This will help you build an email list of people who are interested in your products that you can email 2x per week.

2) Find ways to get your products bundled in with other peoples products that are successfully selling.  Even though it will be at a reduced price, everyone benefits and this will give you a steady stream of sales by piggybacking on other peoples successful efforts.

3) I think one of the best free ways to get traffic to your website is to make videos and put them on YouTube.  People don't require expensive professionally made videos.  Just be yourself and talk about your products and creative ways to use them.  People like people they know.  They will get to know you and your brand by watching your videos.  

People will find your videos based on the keywords you attach to them.  There are all kinds of free keywords tools to let you know what words and phrases people are using when they search for your type of products online.

4) You can collaborate with other small businesses that a social media and/or email lists.  You can all take turns sending out a post or email letting your audiences know about each other's products and service  This is free and can create an immediate surge in sales for all of you.

These are all great ways that can create a significant impact on your business with little to no budget, but you will need to get on the phone and embrace getting to know other businesses and to make these work. 

I hope this helps.

If you meet anyone who is looking at franchises and would like my help I would love an introduction.  ARCfranchising.com