I was VERY happy with the results I got with Osmocote Slow Release 15-9-12 Fertilizer last year on my fruit trees, plants and veggies. I did need to supplement the calcium via bonemeal but other than that it worked phenomenally with only two applications.
I’ve been shopping around for buying it in bulk but it looks like the bulk prices aren’t that much better than the 8lb bag prices. Most places online sell a 50# bag for $100 + ~$25 shipping = $2.55/lb but I can just buy it on Amazon where it dips down to $19 for a 8# bag = $2.38/lb.
Osmocote surely isn’t the only slow release product on the market? Maybe I should be looking for local places that may carry it?
AMAZON PROTIP: Get a price tracking extension like Keepa to watch for price drops of things you know you will need to buy in the future (supplies, tools, etc.).
EDIT: I went ahead and created a spreadsheet comparing different sow release fertilizers on the market in this comment here