Would these be worth selling? (G3 and G1, in the US)

[Khoufu]

G3 Celebration Castle and Rainbow Castle; and G1 Paradise Estate and Dream Castle

What would be a reasonable price if I find one and intend to resell it? Also considering selling my Celebration Castle. I just started getting back into MLP and only know a handful of things to look out for in flea markets, local selling sites, etc.

Any suggestions for other things to look out for? I know most adult male G1s are sought after, Rapunzel, a few mail orders, and some gimmick ponies. I made one bad pricing mistake when I sold what I didn't know was a rare pony, don't want that to happen again.

[lauranthalasa]

I have wondered about those g3 castles too, along with the g3 castle that came out in the UK

[invaderhorizongreen]

I only need the pool liner for paradise estates, and the patio set.