Hey There Retired Guy,
Thanks for getting back to me, I do admit I was intrigued by the website, which was right there in front of me. I did take about 15 min to look at things and wow, there is so much, I wonder how he does it all, must be well organized.
You are right, receipt apps are probably the most popular, we do 2 of them currently, but we are fairly new to saving this way. Right now we use Fetch (having some technical difficulty) and CoinOut. The only other 1 is Shopkick-which is as you probably know is scanning products at certain stores.
Thanks to your advice, I will take my time and see what works best.