Not sure what an S2 is worth, but sell it locked on ebay?

Last time I looked the S2 wasn't worth that much probably as they have released the S3, S4 and various spin offs so while it may generate something it is still probably worth more to me as a useable phone as it is given it does what I need and I have the car bracket and proper charger etc.. So I do need to look at the option of unlocking it and putting a different sim in it.

But I'll do a check around again to see what the usual suspects are offering and the prices on ebay to see if it is worth giving in to temptation and going for the latest and greatest!