Hi there!
I'm not a big player by any stretch, but I've had the same questions as well- I've been all-in on cents, I've been none-in on cents, and everywhere in between. Looking forward to hearing responses.
I dont really expect to get wealthy on pennies, but with Canada getting rid of theirs I'm utterly convinced that its just a matter of time before ours goes too. I dont want to go all in with pennies, but I would like to have around 500-1000 lbs just in case theres a buying frenzy I can cash in on

Ebay seems to have a few very tantalizing prices realized, in the 1.5X range, but there are fees and shipping costs to factor into it as well.
People are buying here at around 1.3-1.4X face, but again usually shipping is on you-
You might be able to set up some local or craigslist deals to get a bit better deal-
I personally havent seen anything (besides flukes) past like 1.5Xface....though again, I'm not big time-
Their time will come, though- it's just that it may take a looooong time!
Still, youre an excellent example of a conscientious grandparent!! I say that equally important in hoarding you cents for your decendants is to EDUCATE them as to the nature of real money vs. fiat, and WHY youre holding these pennies, so they have an appreciation and understanding of them. When one of my grandfathers passed, my brother and I divided up his modest bullion collection. It was about 100 ounces of silver, but my grandmother had no idea what they were worth. Thank God we did! I shudder at thinking of her taking them to cash for gold and getting $500 for it :O
Jmo, any other thoughts?
wags