Sony is selling its 20th Anniversary PS4 online on Dec. 15

Sony has sold out of its secret cache of super cheap PlayStation 4 20th Anniversary Edition consoles in London, but U.K. boss Fergal Gara confirms anniversary consoles will be sold online at regular price to U.K. customers starting Dec. 15, Eurogamer reports.

In fact, 80 percent of the total made available in the U.K. will be sold online, said Gara.

"This is a three-day celebration here in London," he said, "but it wouldn't be fair to our fans across the country if there wasn't access available to them as well.

"We're very conscious of fairness. While it's nice to be able to celebrate here with a retro store, it is the thin end of the volume."

Sony has no plans to make further units available after this batch, he continued.

"There's no plan as yet," he said. "The volume is a close match with the original production run on PlayStation, so it's got a nice heritage story. They're very rare and they're very special. If you put it into mass production you dilute that. So right now, that's it. I'm not aware of any plans to change that."

As was previously reported, the team at PlayStation UK has hidden a pop-up retail store in London which opened today, featuring 94 20th Anniversary Edition PlayStation 4 consoles on sale for £19.94. Additional, a limited edition gray consoles will go on sale at the full retail price, 50 per day, on Dec. 11 and 12 while another batch will be made available online.

The collectible console is sold out in the US and has been fetching huge prices on eBay.

The team at PlayStation Access laid out the promotion in detail with a video released earlier this week. Fans were asked to find the location of the pop-up store. They were also asked to bring along a piece of PlayStation memorabilia, and give a secret pass phase - "I crashed my bandicoot."

All proceeds from the pop-up store will benefit Games Aid, a U.K. based video games charity.