Avalon is selling there a6 on there site for 399 + shipping with everything but the PI but the catch you might have to buy a lot or a few , some one in the bittalk market is selling one a6 for 260 + shipping with everything but the pi and psu .unless you want a S7 .
https://bitcointalk.org/index.php?topic=1558320.0Whichever is the higher earning, avalon or s7, I intend to buy one or two bitcoin mining hardware but before that and because I was new in the world of mining. Can you help me by giving a small explanation where is better than both of it.