Our games also equate 1 gp = $100 USD.
Creating a permanent teleportation circle would be about 20,000 gp or $2,000,000! That doesn't include the costs for any structure to hold it, people to "run" it as a business, guards, etc. Those would be yearly expenses, so you aren't just looking at recouping costs, but covering continuous costs as well. Assuming a competent staff, guards, etc. of perhaps 20 people total, at an average of 1.5 gp / day, that would just about double the costs to 40,000 gp (half for the circle, half for employees and unkeep).
Many businesses require two years to break-even and begin showing an actual profit. This means the "business" would only need to make about 80 gp/day (250-day work year). Then you have to decide how many "inbound" customers would be arriving daily. If you have 100 a day, that would be only a 8 sp "arrival fee" for using a permanent circle as your destination to break-even. If you double that to roughly 1.5 gp, you're profits would be about 20,000 gp yearly (again assuming 100 incoming customers @ 250 working-days).
Since permanent cirlces are "incoming" only, someone has to cast the spell to send whoever/whatever the permanent circle is receiving. This requires a 9th+ level caster, that service needs to be considered as well. However, since the out-going circle will be active for 6-seconds, you could send a decent number of travelers through. Since spell slots of 5th+ level are rather limited, you would like only have a couple out-going trips a day. If you had everyone gather around the "sending circle", you could probably get about 50 travelers per casting. At 2 gp per traveler, that 100 gp covers the material component costs and provides an additional 50 gp for the caster.
Putting it together, the out-bound cost might be 2 gp, and the arrival fee another 1.5 gp; round it up to 4-5 gp total per traveler. While that might seem cheap, it does represent a "modest" lifestyle for 5 days. Most commoners could not afford to travel on a whim.
Ultimately, this depends on the rarity of 9th-level casters to cast the spell. Due to that alone, the price could easily be 10x to 100x or more!
This makes the "answer" very much campaign dependent.