You and your hubby found some very nice pickins, there are a lot of very dedicated surface hunters that have never happened upon a grooved axe or a grooved hammer.
As for monetary value, probably not a lot.
Axes that bring hundreds or even thousands of $'s are more refined in shape and polish and perfectly whole or nearly so and are usually of more desired form and/or of a particular material like porphyry (black with white splotches).
As for age, they could be thousands of years old or just a few hundred years old.
If they were all found in close proximity other indian artifacts in the same place could help date them more specifically.
Most of yours are grooved hammer stones for pounding and crushing rather than chopping and cutting, but the darker one in the middle looks like a pretty nice axe.
Thanks for posting, very nice finds!
Welcome! I presume that you found those west of the Mississippi River? As for value, it all depends on condition and sometimes size. The two nicer ones in your photo may run around $25. to $60. ''This is just an estimate.''