the price sounds reasonable. if freon was added, ask him to find the leak. it is probably in the evaporator. the system is getting old and some explanation of industry changes should be explained so you can make informed decisions about how to continue spending your money. if there is a leak in the evaporator, it can only be corrected with replacement. r22 refrigerant is being phased out and you may want to consider upgrade. you don't have to do it now, but plan for it in the future. the service he did did not cause the fan bearing problem. it is just another sign that the system has seen its better day. that said, a motor replacement is minor. if you don't want to upgrade right now, replace the motor and have him install pressure controls and a time delay relay on your system. at least the system will have some monitoring and the compressor will have a degree of protection. the upgrade could run anywhere between 5 and 15 k depending upon the system size, efficiency rating, level of difficulty and whether ducts are replaced. weigh your options and be happy if you have someone referred to you that won't cheat you. good luck.