I’ve found many books online at half.com or ebay for very little. I always look for ones with large pictures and very little text. The Van Gogh book I have is fabulous and I paid $9 for it!
The way we generally do picture study is to use the painting as the backdrop on the computer for that week and I have 4×6 prints made for each child that they put into their Artist Photo Album where we label the picture w/ artist, title, date and anything they want to add. The big prints are FREE b/c I just downloaded and saved as a backdrop. I pay about 12 cents per print for their individual prints. I do think it’s easier to look at a larger one for actually studying the picture.
HTH,
Christie