use webtask.io + twilio to find things on PCA fast.

pca.js

var request = require('request');

return function (context, callback) {
    var required_params = ['TWILIO_AUTH_TOKEN', 'TWILIO_ACCOUNT_SID', 'TWILIO_NUMBER', 'SEARCH', 'TO'];
    for (var p in required_params)
        if (!context.data[required_params[p]])
            return callback(new Error('The `' + required_params[p] + '` parameter must be provided.'));

    function message(to, message) {
        request({
            url: 'https://api.twilio.com/2010-04-01/Accounts/' + context.data.TWILIO_ACCOUNT_SID + '/Messages',
            method: 'POST',
            auth: {
                user: context.data.TWILIO_ACCOUNT_SID,
                pass: context.data.TWILIO_AUTH_TOKEN
            },
            form: {
                From: context.data.TWILIO_NUMBER,
                To: to,
                Body: message
            }
        }, function (error, res, body) {
            if (error) return callback(error);
        });
    }

    function check_pca(id, nxt) {
        request({
            url: 'https://www.pca.org/classified-ad/' + id
        }, function (error, res, body) {
            if (error) {
                return callback(error);
            } else {
                if (res.statusCode == 404) {
                    count404 += 1;
                }

                if (res.statusCode == 200 || res.statusCode == 403) {
                    nxt(id, re.exec(body));
                }
            }
        });
    }

    var re = new RegExp('<title>(.+' + context.data.SEARCH + '.+?) Date Created.+<\/title>', 'igm');
    var count404 = 0;
    var countDone = 0;

    context.storage.get(function (error, data) {
        if (error) return cb(error);
        data = data || { counter: 313596 };

        while (count404 < 3 && countDone < 10) {
            data['counter'] += 1;
            countDone += 1

            id = data['counter']

            check_pca(id, function(id, match) {
                if (match !== null) {
                    message(context.data.TO, match[1] + " https://www.pca.org/classified-ad/" + id);
                }
            });
        }

        // save, minus the seen 404's
        data['counter'] -= count404;
        context.storage.set(data, function (error) {
            if (error) return callback(error);
        });

        callback(null, "Done: " + data['counter'])
    });
}