Well, taking weapon popularity and capabilities into account, the Kama one is pretty worthless. It has low stats, even for a machete. less than 10% for either crit OR status, which takes away virtually ALL scaling. TBH you could burn that one for Endo and you probably wouldn’t lose out on anything, but I could see it selling for 50p if you find the right person.
Hek one could possibly hit 300p, maybe more. It’s a good gun, and extremely popular.
Ignis, similar, but that’s an uncanny Riven. Have not seen ones with that much damage and no penalties. I would not be surprised if you could sell it for 600+.
Sicarus Prime recently got buffed (twice) and is presently an absolute monster. A Riven like that might sell for 400+. But despite being really strong, Sicarus P is vaulted and the buying market is a fraction of what other guns are. It’s also a burst pistol, which is super weird to use compared to things like Lex Prime and Akstiletto Primes.
That Soma one is pretty damn good for a Soma mod. Being that is has really low disposition, it won’t really offer anything over most things you’d replace with it. However, the vast majority of players are morons and if they see a crit stat they go crazy. I’ve seen (and sold) worse mods for 400p. Could see that one hitting there.
Rivens are worth more than Prime parts. Lots more. Never make that trade. Ever.