Spotty Process: Price for a given instance size in a single availability zone

response.js

// Request using availability zone codes and instance type codes
// curl http://spot.arfon.org/instances/m1.large/us-east-1b
// Example response below

[{
  "availability_zone": "us-east-1b",
  "current_price": 0.026,
  "id": "50b196d8a2fc8eef100000c0",
  "name": "m1.large",
  "pricing_history": {
    "2012-11-23 20:03:51 UTC": "0.026000",
    "2012-11-24 20:05:22 UTC": "0.026000",
    "2012-11-25 20:05:42 UTC": "0.026000"
  },
  "product_description": "Linux/UNIX (Amazon VPC)"
}, {
  "availability_zone": "us-east-1b",
  "current_price": 0.066,
  "id": "50b196dda2fc8eef10000123",
  "name": "m1.large",
  "pricing_history": {
    "2012-11-23 20:01:50 UTC": "0.066000",
    "2012-11-24 20:02:23 UTC": "0.066000"
  },
  "product_description": "Windows"
}, {
  "availability_zone": "us-east-1b",
  "current_price": 0.032,
  "id": "50b196d8a2fc8eef100000c4",
  "name": "m1.large",
  "pricing_history": {
    "2012-11-23 20:03:49 UTC": "0.032000",
    "2012-11-24 20:05:21 UTC": "0.032000"
  },
  "product_description": "SUSE Linux (Amazon VPC)"
}, {
  "availability_zone": "us-east-1b",
  "current_price": 0.032,
  "id": "50b196d2a2fc8eef10000052",
  "name": "m1.large",
  "pricing_history": {
    "2012-11-23 20:04:24 UTC": "0.032000",
    "2012-11-24 20:05:58 UTC": "0.032000",
    "2012-11-25 20:06:21 UTC": "0.032000"
  },
  "product_description": "SUSE Linux"
}, {
  "availability_zone": "us-east-1b",
  "current_price": 0.026,
  "id": "50b196cda2fc8eef10000001",
  "name": "m1.large",
  "pricing_history": {
    "2012-11-22 20:04:46 UTC": "0.035000",
    "2012-11-22 20:37:48 UTC": "0.026000",
    "2012-11-22 20:55:27 UTC": "0.035000"
  },
  "product_description": "Linux/UNIX"
}, {
  "availability_zone": "us-east-1b",
  "current_price": 0.066,
  "id": "50b196d2a2fc8eef10000047",
  "name": "m1.large",
  "pricing_history": {
    "2012-11-23 20:04:29 UTC": "0.066000",
    "2012-11-24 20:06:06 UTC": "0.066000"
  },
  "product_description": "Windows (Amazon VPC)"
}]