Do you type in a part number? Nope
Do you look at a category? Nope
Do you go directly to a favorite seller? Many times I start with a few of my favorite sellers.
Do you search on a a single key word? Usually, or for a particular items
If more then one seller has a product what makes you buy from one over another?
Several things will determine this for me. First the sellers feedback, If a seller has poor feedback, slow to ship, poor communication after the sale, etc. I will avoid this seller. And also SHIPPING costs, this is a biggie! If they charge a buck or two less for something but then smack me with a huge shipping charge I look elsewhere. First of all you in the event of a claim you are only protected for the item price and not the shipping cost, so in the event of a claim if two sellers end total was the same, but one had a much lower item price with a jacked up shipping price, all you can hope to regain is the low item price, the shipping is gone. Also most people who shop online have a fairly good idea how much it cost to ship something. I look for a competative seller with good feedback. I have my few favorites that I will almost alway check with first then go from there.