Update SD card from Class 4 to Class 10

Update prices

shoppinglist_usa.md

@@ -2,11 +2,11 @@
 
 *The RaspiBlitz software is build and tested for the following Hardware set that you can buy cheap on Amazon.com:* 
 
-* RaspBerry Pi 3 ($41.00 USD) http://a.co/ahl7RIp
+* RaspBerry Pi 3 ($39.70 USD) http://a.co/ahl7RIp
-* Micro SD-Card 16GB ($6.75 USD) http://a.co/6R49HZz
+* Micro SD-Card 16GB ($5.99 USD) http://a.co/d/710f4oJ
-* Power ($7.99 USD) https://www.amazon.com/Yuconn-Switch-Charger-Adapter-Raspberry/dp/B071YC2T9S
+* Power ($8.88 USD) http://a.co/d/fVVOYZZ
 * 1TB Hard Drive ($49.99 USD) http://a.co/eUgVfLd
 * Case ($7.99 USD) http://a.co/1774Hwl
 * LCD-Display ($19.99 USD) http://a.co/65p2wu6
 
-**Total Price: $145.95 USD**
+**Total Price: $132.54 USD**