added script for rudimentary shop stock checks

check_shop_stock.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+#
+# Checks when the Bat Bone is in stock again
+
+useragent1="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500 .45 Safari/537.36"
+useragent2="Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0"
+url="http://shop.flitetest.com/multirotors/bat-bone-tri-370-kit/"
+error="Product is out of stock</div>"
+recipient="oli@lugh.ch"
+
+# Shuffle User Agent
+rnd_ua=$(shuf -i 1-2 -n 1)
+
+if [ $rnd_ua = 2 ]; then
+	ua=$useragent2
+else
+	ua=$useragent1
+fi
+
+curl_cmd=$($(which curl) -s -A "$ua" $url | grep -c "$error")
+
+if [ $curl_cmd -lt 1 ]; then
+	echo -e "$(date)\n$url is available again!" | mail -s "In stock again ($url)" $recipient
+fi
+