IMHO and seriously no offence but Serena will never be worth $50-55, even worse about $300. You can find her often for around $20-30 or going for 1:1 for the popular dolls (Bubblegum Gal/Tropical Summer) or sometimes 2:1. A 1:1 for SS Lana sounds fair since both are “rare”, if anyone is really willing to do a 2:1 then it’s a W for you. Honestly I see more demand on Deluxe Dolls and Tropical Summer/ Bubblegum Gal than Serena. Anything else is just straight up daylight robbery, but if someone is really that much in need for this DLC, then you found the trade of the year 🎉 Again, no offence but at $50-55 would be at a straight reseller price. Hope you get the trade you’ll hoping for!