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Yo Jess, there’s a place in Mansfield (MO),Baker Creek Heirloom Seeds, that sells those seeds, or at least a similar variety. I grew some a few years ago that looked exactly like the photo you linked to, I believe this was the variety:
http://rareseeds.com/seeds/Cucumber/Mexican-Sour-Gherkin
and they were basically bite sized cucumbers. These sound even tastier because they are apparently more melony:
http://rareseeds.com/seeds/Cucumber/Richmond-Green-Apple
PS It looks like they have a blog too…