Yes there are differences
Usually for Ryobi days it is buy a battery or starter kit and get a free tool
This deal in the past has been hackable to make it cheaper, but HD is making that harder to do.
Should be starting in 2-3 weeks
Here is last years Ryobi Days info...
Did not really need more than one 20 pack, but this came up in my search for $31 for ten 20 packs from AWD, so I got it.
Will use as heavy duty clothes pins mostly.
Seen this at SD
In Store only
Looks like
SAE OW-20
5W-20
5W-30
are available at many locations
EDIT
Looks like a 4 pack for $63.99 is available to members online
https://www.costco.com/motor-oil.html?price=50-100&deliveryFacetFlag=true&refine=||item_location_pricing_salePrice-50%2Bto%2B100
From Amazon
Got this generic Ryobi clone for $28 with a 30% off coupon
Seems good and coupon still in effect so I will get another
Got this mini chain saw because it was blue.
See how works Monday
Didn't really need this, but since it came with a case I got it to keep everything together.