JSFiddle - React, Tailwind, and code Playground

JavaScript

var pricing = {
    "activities": [{
        "activitycode": "TK",
            "desc": "Tickets",
            "ticketTypes": [{
            "ticketcode": "G",
                "baseprice": 79
        }, {
            "ticketcode": "P",
                "baseprice": 109
        }]
    }, {
        "activitycode": "PK",
            "desc": "Parking",
            "ticketTypes": [{
            "ticketcode": "BK",
                "baseprice": 65
        }, {
            "ticketcode": "ESC-I",
                "baseprice": 40
        }]
    }], //end activities
    "handlingPercent": "0.03",
        "shipping": "15"
}

var test = $.grep(pricing.activities, function(e){ return e.activitycode == 'TK'; });
var test2 = $.grep(test[0].ticketTypes, function(e){ return e.ticketcode == "G";});

console.log(test2[0].baseprice);

$.each(pricing.activities, function(arrayID, activityData) {    
if(activityData.activitycode=="TK")
    $.each(activityData.ticketTypes, function(ticketTypeID, typeData) {
        if(typeData.ticketcode=="G")
        console.log(typeData.baseprice);
     });
});