Spats is probably right, as the store was always accessible for me too.
Telltale took advantage of the sale to reduce their inventory as much as possible as they were moving to a larger warehouse and the store lost items daily as they sold out, leaving only games by the end of the sale.
They will probably add merchandise back to the store when the move is complete (according to the banner at the top of the store's
homepage, they are planning to start shipping again on August 1), but the sale prices are most likely gone until... their 8th anniversary sale?
Also note that not all items will come back as Alan posted the following comment in the
blog post announcing the 7th anniversary date:
"We're discontinuing a bunch of these items and clearing out our warehouse. And of course, celebrating our 7th Anniversary!"