Price on games changing

Im trying do buy a game, and i keep almost getting there, but the price keeps changing. 11.31 to 11.43 to 11.99. Why is this happening?

Salad has games from a few different sources. For some indie games, we partner directly with the game developer. For bigger titles, we resell keys through 3rd party marketplaces. There isn’t a stable supply on the 3rd party marketplaces. They may have a handful of keys listed from one seller for one price and a second handful of keys listed from a different seller for a different price. Salad will always obtain the key with the lowest price. However, if the lowest priced keys are all sold, the price will increase to the next highest. If you’re seeing the prices fluctuate, the game may either be really popular or there may be a very limited supply of keys.