It would be handy to have a way to isolate marketplace items your considering purchasing. A check box to add the item to a watch list so you can more easily keep on eye on things without having to go through the entire inventory of categorical offerings in the marketplace. A direct purchase icon from this watch list would be helpful as well.
My 2 bits
agreed.
I just paste the urls into a list I have on my google keep for now of things I might like to buy in the future
I do this as well. I would be nice though to be able to see them in an online watch list so you can easily compare them when your ready to purchase. I figured it was worth the suggestion.
Oh, and what if you could be notified when something on your wishlist went on sale? 
I agree, this would be a very handy feature.