I guess it depends on what you mean by chutney because like curry it’s become something of a catch-all term. Do you mean the mint/date style chutneys served with Indian snacks, the stickier jam-esque chutneys or the spicy pickles or the ones that are like a really spicey hot jam?
The biggest reason you may not find a chutney clearing house is that Indians still make them at home from scratch. My parents make all their preserved pickles and chutneys in August (chili, mango chili, lemon etc.) after their garden harvest comes in and then make the fresh ones on an as-needed basis.
My favourite is definitely that sticky mango one my mom makes that’s runnier than a jam and spicy-sweet as hell. It’s a Konkani specialty (she’s Goan). Other favourites are this Punjabi one that I like eating with chana…panchasomesome, ambli (also konkani), sweet tomato and grated garlic coconut. I remember when my mom used to make me and my sister help her peel the cloves for garlic-coconut, our fingertips would be stinging by the end of the day. I think she may bring that one back from India now.