I inquired about the bricks a couple of months ago and a gentleman that I spoke with told me that they were looking into selling them again but he didn't have a date or price. He took my name and contact info and put me on a list so if they do start selling them again I should be contacted.
Be careful what you ask for.
When they started selling them again about a year or so ago, they created a huge MESS due to very limited availability and equally limited and poor communication with those who tried to buy the bricks.
These new brick sales lasted only for a month or two and the bricks cost $300-$400 each

during that time.
Many hopeful buyers at that time were left hanging for weeks without any word on whether their brick orders had been accepted for placement.
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Some history-
When first announced in the 1990's- and continued throughout the original "program"- WDW stated that the bricks were to be a part of a walkway where guests could stroll "completely around the Seven Seas Lagoon." That info was even a part of the monorail spiel for years.
But even back then, it was apparent that if a continuous walkway around the lake was not physically impossible, it was certainly fiscally impractical.
On the "path" between the Grand Floridian and MK, there is a much used "inlet" of water which is where the "Electrical Water Pageant" barges are stored. That would require a new bridge to be constructed and that bridge would either have to be an expensive "drawbridge" (I know they CAN do that, there's one on the WS Lagoon in Epcot, near China and "Africa") to allow the use by the EWP barges and possibly other higher profile watercraft, or simply find another waterway area to store those barges, etc.
But that side of the "loop's" problems pale by comparison to the MK-to-TTC section of the walkway.
It would require a wide, safe foot-traffic lane that runs through the same "under-the-water bridge underpass" portal near the front of Contemporary.
Back before MGM and several new resorts were built far removed from the monorail lines (and necessitating the operation of MANY new bus routes), save for those guests who drove to the CR, this ugly, narrow passage, with its steeply-inclined approaches and many exposed pipes and conduits, was never seen by most guests... UNTIL WDW decided (wisely) to put the resort bus stops for MK over AT the MK front gates (and not at TTC).
After that decision, the idea of threading a guest walkway though this too-small and now VERY BUSY underpass was simply not feasible.
So now, the bricks that were purchased back when the "Walkway Around the World" project was still a "go" are still THERE (they ARE bricks, and in Florida's seldom-deep-frozen climate, they should last a very long time), and I don't foresee a need to remove them or, since the promised "walkway loop" is abandoned, charge anyone a fee to "renew" them when they "dropped the ball" on the promised project.