Anyone can do it wakebuster, just make sure they're very active, the more active the better, I tend to buy with activity more than stats. I keep one 40bil inactive for MP. I usually trade with 12 40bil allies and one 316bil.
The price you shop is the most important, a dropped ally will be in a different price range than an ally that has been vollied normally. Check Havoc's ally trading guide for the exact prices, has to be that exact price.
Try a few and see what works. Lower prices have more available buyers, but bigger ones get you more gold per sale.
@n8. Look at the sub clan of a well developed clan. Look for a player at the cost you want and check the clans EB history to see if they're active
That's what I think mindful. T3 cane out we got lvl 4 guild. T4 came out we got SoS. If the trend continues, then we should get a lvl 4 SoS. But who knows?