I hate to see a thread with no replies so I'll wade in.
I don't care for the big-head thing personally but plenty of people do and those are two characters popular with bronies....a quick check of eBay sold listings show they each go for between $10 and $20 (us) including shipping. I saw a couple of Trixies that went for like $2 at auction so....if you want to make sure to get your $10+ you might want to avoid a low-starting auction just in case unless you just want to move them along quickly.