We've been working on a site as a side project for ~2 years now. It's had great media attention, good growth. It's profitable, there are clear models for greater profitability, but we've hit an inflection point; we either need to dedicate a large amount of time to building it out or sell it, and we're leaning toward a sale.
We've seen flippa (sitepoint), ebay and digitalpoint's marketplace - it doesn't look like the liquidity/volume is there to support acquisitions in the price range we think we're worth.
So, how/where do you sell yourself in the ~100k range?
Competitors: as long as you have more than one, and one of them is bigger than you(to afford the $100K).
Customers: if some of your customers are big in the industry you serve, one of them might pick you up.
Media Companies: look around to see if there is one that lacks a website in your space.
Or you can setup a webpage for users to throw together a bunch of money, and then help them register a corporation, which will then take the pooled money and buy your company.