1. Just checked Guru's minipet price guide thread. Someone back on December 5th sold a Mini M.O.X. for 80e in about an hour. Adjust it for time elapsed and I'd estimate ~75e would be the price now.
2. Not sure what the 7/15 shields are worth anymore. Probably not much, to be honest, with the declining state of PvP in GW1. Also, a few months ago I noticed people were also into 6/14 inscribable shields as well, so save any of those you come across.
A quick scan through of Guru's sell forums didn't find me any 7/15's for sale. I'd say just offer it up in town with a 'PM offer' and see what you can bargain for. I'd start with something fairly high like 10e or something and settle if bids are slow to arrive. If a 10e bid comes lightning quick then it's probably a safe bet that you can get more for it (~15e or so), so tell the dude 'sorry, already sold' and sell it again the next day marked up.
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