The first two have big catalog values (multiple hundreds of dollars) but their condition is such that they don't hold high resale value. Because of tears, thins, pulled perfs and/or poor centering, they might get $10-$20 each on
ebay.
The three cent has nice centering and large margins, but is probably a $12.50 CV stamp. If it wasn't creased, it might sell for $5-10, despite the straight edge.
I don't see a scan of the grill on the 3 cent so I can't determine if it is one of the scarcer grills. Edit: Thanks for posting a scan of the back of the 3 cent. Yes, it looks like the common F grill #94.