Most of the stuff he sells is for GR cash. And he can quite expensive if you aren't careful.
There are also a handful of items available for sale in BIG MART for coins.
A great tip for BIG MART that many players are often unaware of, is that you can buy BIG MART items for an unlimited amount of experience. For any other neighbor there is a cap. That does not exist with BIG MART.
You will get experience no matter how much you buy from BIG MART. It's also a great way to build coins and experience quickly.
For example, Coconuts are widely accepted as the go to item for quick leveling.
So I bought 100 Coconuts. Take a look at that price too and remember it for just a second.
Now this is my experience
1226 experience is my gain.
And then of course I don't really need coconuts so I will sell them.
And look! PROFIT! $25,650 to be exact. And if you haven't reached your regular ingredient cap you will get that additional experience as well.
Probably one of the most underused aspects of Gourmet Ranch is the BIG MART. Once you get past those initial quests of where you have to grow it, you will never need to grow it again.