I am finishing up buying everything that I need to complete my helmet and cannon motorization, and I'd like to share with everyone the cost of motorizing your Iron Patriot. The below spreadsheet is adapted from
laellee 's parts list, but I've made it a bit easier to follow, fixed up some of the item part IDs, and added in things like the actual microcontrollers. (Also, the color code is for the 2 separate purchases I made, since I didn't buy it all at once!)
Iron Patriot Motorization Costs
Click for larger!
Like Lael, I bought the huge majority of parts through ServoCity.com. Their selection is awesome, their shipping is crazy fast, and you can really save on shipping costs by buying everything all from one shop. Also: Don't be afraid to ask about discounts! I contacted them via Twitter and got a 10% off orders over $100 coupon code.
I also bought all of my electronics through Adafruit. There are a few other electronics/Arduino retailers online, but I like them because their prices are great. And again, ask them on Twitter if they have any running coupon codes or specials and they'll help you save money!
My parts list here is missing a few things. Specifically, the gyros and all of the eye LED components. I outsourced this to a friend of mine and I haven't gotten the exact price for everything just yet. It's ~$80 for 2x gyros and 4x eyes. We had the PCBs printed from OSH Park and used SMD LEDs. Also as a note: you definitely want to buy TWO gyros, not just one! I'll go more in depth on why later once I have everything in hand and I'm putting it all together.
Also keep in mind that I bought a cast helmet here off The RPF and I put that on my parts list. If you're making your own then obviously you don't need to factor that in.
If anyone wants the actual spreadsheet I used, feel free to contact me. I need to fix a few things and add in the missing Adafruit part IDs but I'm happy to share.