So this suggestion is dependant on what your time is worth and how many you want.
But, a lot of these people selling this stuff are from Shenzhen. From experience, you can get pretty much anything in Shenzhen, if it's not off the shelf then someone will happily take your money (for a westerner it's generally peanuts) and make it for you. All you have to do is ask.
With eBay this is all a bit difficult but if you jump over to aliexpress or the like, find someone selling close to what you want and send them a message with a picture of exactly what you're after (their english is likely to be very poor) and a qty that makes it worth their while, most of the time you'll get what you want.
In the markets in Shenzhen you can ask someone if they have a particular thing, often the answer is no. However, if you say it with a smile, they'll usually have it for you within a couple of minutes.