First issue: https://verbum.com/search?context=product&sortBy=price-low&limit=60&page=1&view=list doesn't show the free Augsburg commentary among the $0.00 books, nor the $0.99 one between the $0.95 and the $1.00 books.
Second issue: It does show an awful lot of datasets and CS Lewis books that aren't the least bit free. Very annoying and not very honest.
Third issue: You need to tweak your search algorithm. A search for "augsburg corinthians" should put the 4 Augsburg commentaries on Corinthians at the top, not way way down the page, below lots of books that only include one of the search terms.
