Lug Nuts for Stock wheels?

[Lookin4SVX]

I want to put on this set of stock wheels I got that have some blizzaks on them for winter tires, but I don't have the stock lug nuts.

So, I need a full set of lug nuts for a set of stock wheels.
The dealer quoted me some ridiculous figure for a full set...

I went to the local pepboys and they guy behind the counter searched the computer and then told me they don't have it in the system...

I have no clue when it comes to lug nut shopping, what exactly do I ask for? Dimensions, type, shape?
If remember right, I read something about some lugs fit but eventually loosen, but I cant find the thread at this point in time.
I will drive the car less than 100 miles all winter, so them ones that loosen eventually may be an option to me as long as they are cheap.
I just need wheels on it to move it out the driveway so they can plow.

Can someone please tell me what the cheapest option is?