On page 550, table 15-29. There is a chart for estimating the values in gold pieces.
On the "Special" section there is an entry for boots of teleportation.
It says "Divide by (5 divided by charges per day)".
What does that mean?
The boots of teleportation are CL 9th and has 3 uses/day.
charges/Spell trigger items cost Spell level x CL x 750. so that would make it cost 33,750 gp.
But the boots cost 49,000 gp, that's a 15,250 gp difference. Where does the 49,000gp come from?