Emerge and Roadbuster pretty much covered everything. I will say this though, while that $200+ price tag may seem a lot, in the long run it may actually be cheaper.
Finding a junker and fixing it with other junkers can be relatively cheap, but it's the accessories that will push the cost up, factor in time and suddenly you're looking back and thinking "I could have saved myself a lot of time and money if I'd just shelled out the $200".
Learnt this lesson myself with Scorponok.
As for resources ... forums like this, Facebook Groups/Marketplace, e-Bay ... there's lots out there. I'm part of an Australian Facebook Group dedicated to G1 bots/parts and repairs, so when you need help, you'll find plenty of it!