To be honest a lot of it has to do with the condition and if it still comes in the box. If so then I would consider it brand new in the box or Like new lightly used in MINT CONDITION! Either way you shouldnt ask for less than what you would buy it for yourself. I personally dont think that 350 for a mint condition TP2 with extra accessories is that bad. I kinda see it as a steal deal. I personally woulnt sell my TP2 for anything....Other than a TP3 if they ever come out with one.
But thats just me. But when times are hard you gotta do what you gotta do! Anything less the 350 would be a bargain. I say put it up on ebay for a buy it now price of 400 and start your bid at about 280. If someone wants it bad enough given all the accessories they will pay money for it. But either way your promised over 300 for it. Well thats my take on it. Ive sold a lot of phones on ebay and that would be my go on it. 5 day listing with a buy it now price of 400 and a starting bid at 280 titled:
(((SPRINT TOUCH PRO 2 LIGHTLY USED)))
((((MINT CONDITION WITH ACCESSORIES))))
Ive made over 2000.00 in about a 2 months period just selling my old phones from Sprint. Wish I had more to sell, but kinda hard to come by.
Good luck tho. I would definitely agree about not settling for less if you dont have to.