joe, I think the difference is Free Regular Post & Free Express Post - you can see it immediately, it's stated on the photos.  Personally I think that's a great idea as so many buyers don't read descriptions, but then again, maybe not everyone notices the writing on the photo - totally agree with your comment 1 thing some buyers look for is honesty so it may be worth while the OP making the point a little clearer - that said, I only had a very quick look , so maybe s/he has already

Edit.  They are all Free Post