How can buyers buy an item at a cheaper price than what it is listed for?

[kids-toys-n-gifts]

I have an item priced at $39.95 free postage.

A buyer purchased this item and was only charged $37.95.

I did not send a code for any discount and they only made a single purchase

[gutterpunkz05]

The original post also claimed  free postage,  nothing adds up.

[sandypebbles]

And they only mention the buyer buying an item/this item rather than two of them 

So I've no idea 

[imastawka]

I think I found the answer - just because I clicked on the item, I got an offer.

[gutterpunkz05]

Interesting!   Does the offer come with free post.

No offer here, so can not tell

[imastawka]

No free post.

Postage $9.90