I needed 12V dc fan for a particular model. but I dont know why whenever I ask for the particular model of the fan he keeps on increasing price by double. After some time, he said that he doesnt have that fans (contradicting his previous statement) and after some discussion, he told me to get out of the shop. Note that, in this whole discussion, he spoke very rudely to me. I think he will treat you in a nice way if you have a big order for fans otherwise he will tell you to get out.

Genuine source for your instrument cooling fans