Well, I've been here a while but I'm still a noob
Which sites come out best in specific searches (from a buyer point of view). I don't recall seing a thread here.

From my own perspective, I'm not too keen on the sites that don't do exact matches. I'm only with Canstock at the moment (and Zazzle, and...). Particularly relevant to me, a search for 'plow', shows results with a 'plowed' field, but no plows, and my 'plow' coming way down the 'field'. This is an enormous handicap to being found, and probably frustrating for a buyer looking for a plow and just finding plowed fields, excluding the handicap of the US spelling when it should be plough anyway! Just out of interest, are there any sites that show exact match first?

for illustrations, especially when you search using the "images" category at google, canstockphoto ranks very high. for some reason, clipartof are always well represented on the first page as well.  And then the usuals, shutterstock, 123rf and istock.