$5500 is around the "going" price for a Dealer Scared Stiff - and it would have to be a machine that has had a thorough reconditioning process completed on it - That would include stripping the machine, replacing ALL globes and rubbers, cleaning all parts and reassembly. Boards would be upgraded etc..
Wotto had a pearler of an SS for around the $4000 mark.
I guess my advice would be to ask all the relevant questions (as above).
As much as I love SS, if you can source a Fishtales AND a Flintstones for $5500 - then that would be your best option.