I thought it'd be useful if we had a record of what free rewards we can get from sharing memories. Below are the items I've received so far. I think it's worth noting that this is the only way (that I've found) to get a free hot tub.
First is the BBQ (grill) - 3 memories,
then a bookcase (it's bigger than it looks) - 5 memories,
then a computer,
next the hot tub - 25 memories,
and a workout leotard - 50 memories,
and then a toddler outfit - 100 memories?


I'll post what the last reward is when I get them.