There's really only two parts you can't make yourself, and you probably could, but for now i'm not. You need a cheap android phone to be the screen, and you need the receiver. 

Here's where I got the phone: https://www.walmart.com/ip/Straight-Talk-Alcatel-onetouch-Pixi-Avion-A571C-4G-LTE-Prepaid-Smartphone/52243159. You could probably buy it at a store and get it for that price, but i ordered it and paid way too much for shipping, $7 i think.

The receiver can be bought on ebay here:  https://www.banggood.com/Eachine-ROTG01-UVC-OTG-5_8G-150CH-Full-Channel-FPV-Receiver-For-Android-Mobile-Phone-Smartphone-p-1147692.html?rmmds=search&cur_warehouse=CN, but you can find it on ebay for less.

Also, when the seed money goes out, i added these to my cart: https://www.ebay.com/itm/112857909371. They're just like the ones in the google cardboard goggles

One more thing- the phone i bought says it can't run the app, i can't remember the name, because the phone "doesn't have uvc drivers" to run it. If anyone knows how to download those, some tips would be great.