Let's assume you're referring to a radio flyer type wagon: Yes, there are a few here but, I haven't seen any for a while, much less the builders...
Your question is pretty direct, like you don't want speculation, you
only want those who've done it to respond. Problem is, as stated above, those guys aren't around ATM...
The bottom line is, how long is a piece of string? The more you put into it, the more it will cost; simple things like choice of wheels can change the price by a
few hundred dollars...
Sorry you're having such a hard time with this but, in most cases, a set budget usually goes out the window by the time the build is complete anyway
