Okay, so...
The roller skate ponies are pretty valuable. They tend to go for $35-50 these days, although I believe that Hop Hop and Jazzie are more sought after than Melody is.
Deflocked Truly is probably worth $15-25.
Your Tex's cancer spots and hard body will lower his price by quite a bit. I'd say he's worth $5-10 with those flaws.
Deflocked Lofty is worth the same as deflocked Truly.
Chatterbox is worth about $25 in good condition, especially if she is in working order. I'm not sure, maybe she's worth a little less, but G1 from years 6-10 are not exactly within my area of expertise.
Good luck with your selling!