1. Please use a descriptive topic next time.
2. All shops will tell you it's working fine. It's up to YOU to determine if it really is.
3. You can also consider buying here from clubsnap BnS, may be cheaper than the shops.
4. Read the MANY "buying 2nd hand dslr" threads to see the normal checklist.
5. If in doubt, bring a friend along who knows what they are doing.