Yeah, I'm in a little group of 30-40ish called Raging Barbarians, mostly because their leader invited me after a match and they had pretty much everything researched. The main things to look for in a group are: a) most/all clantech researched and b) not a member-clan of ICE, because fuck those assholes, their battlepay baiting, and their 99% taxes. They're just Eclipse 2: Shitlord Boogaloo, even if you don't think that it's suspicious that DE servers got DDOSed right during crucial Solar Rail fights that gave them control over major DS nodes.
RE: Discontinued Prime stuff. I'unno where prices are pegged at exactly, but IIRC a lot of the inflation was on console, not PC.
WFT Pro pegs the parts at a range from 20p (Helmet) to 50p (Systems) on the low end, and their prices generally highball things anyways, as I'm usually able to buy parts at or below their "Low" listings.
Just yesterday I picked up all the components for a Latron Prime (which was also discontinued at the same time) for 10p per part and 13p for the Receiver, which falls into that same "Low" range at WFTP, for 43p total for one of the best weapons in the game which no longer drops parts.
So yeah, if you are discerning and haggle properly you should be able to pick up Frost Prime for 200p or less; I'm planning on getting it myself soon.
Keep in mind that once you're at the endgame it's relatively easy to earn plat; a maxed Serration, Vitality, &c. (or any core 10-dot mod, really) will sell for several hundred plat easily, considering how much time and credits it takes to make them (though, naturally, endgame players have relatively little to do with all of the credits and trash rares that accumulate).
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Also folks, just a couple days until the trader shows. If you're really desperate to scrape together some ducats now's the time to start grinding Void missions or buying cheap parts.