The first is the Adam gallery which is a real gallery in London and a branch in Bath, which is where I was persuing their paper catalogues last week. But then I found that they have many for free as downloadable PDFs. Go to their website and click on contemporary artist and then the artists name. There is then a link on the left for artist profile. If there is a PDF there will be a link to it on that page. There are three by Barbara Rae and two by Julio Rondo for example.
Then my beloved October gallery in London ( oh how I miss the days of working near that and nipping in after work) has a new PDF catalogue of El Anatsui's ASI exhibition.
I love having these PDFs on my ipad in Kindle and having them handy for odd free moments or lunchtimes at work.
Kathleen Petyarre Genius of Place for just £10 plus postage. When I checked, new copies were £86 on Amazon!
I would also recommend their small catalogues of Ablade Glover and Nnenne Okora's exhibitions - I return to mine all the time. At £5 each a good buy. They do post internationally. ( I have no connection to them - just love the art they show!)