nexus5.sh

#!/bin/bash
URL="https://play.google.com/store/devices/details?id=nexus_5_32gb"
EMAIL="youremail@example.com"
mkdir -p /tmp/googleplay/
rm /tmp/googleplay/after 2>/dev/null
mv /tmp/googleplay/now /tmp/googleplay/after 
curl "${URL}" -o /tmp/googleplay/now
len=`diff /tmp/googleplay/now /tmp/googleplay/after |wc -l`
if [ $len != 0 ]; then 
        echo "${URL}" > /tmp/content.txt
        cat /tmp/googleplay/now > /tmp/che.html
        /usr/bin/mutt -x -s "Nexus5 available on GooglePlay" -a \
                /tmp/che.html -- ${EMAIL} < /tmp/content.txt
fi

Quick setup tips:
Setting up postfix to work with Google Apps - http://blog.bigdinosaur.org/postfix-gmail-and-you/

Setting up this script:
chmod +x nexus5.sh

Use the following line for crontab to run every 5 minutes:
*/5 * * * * /home/mydirectory/nexus5.sh
good guide on crontab - http://www.thegeekstuff.com/2009/06/15-practical-crontab-examples/