Quoted from vid1900:Tayda is probably the cheapest with fastest shipping; .02 cents each
https://www.taydaelectronics.com/diodes/standard/1n4007-1a-1000v-rectifier-diode.html
Tayda is great, I have bought lots of stuff from them. I also get a lot of maker bits and pieces from Aliexpress, if you are an extreme cheapa$$ and you don’t mind waiting several weeks that is the way to go for many items. There can be some problems on occasion such as things not showing up, but I have never had an issue making a claim. But what I do now is try to funnel all my business through a store there called WAVGAT. I have never had any issues with them and they give good customer service and prompt delivery (considering it comes from China).