Buy up
Definition 1 of 1
Pro Tip 1/3Market Impact
Using 'buy up' can imply trying to control a market by owning a large part of it. 
Startup companies often fear that big corporations will buy up their innovative products.
Pro Tip 2/3Urgent Acquisition
'Buy up' suggests a sense of urgency or a rush to acquire something quickly. 
When the sale was announced, shoppers rushed to buy up discounted electronics.
Pro Tip 3/3Scarcity Implication
By using 'buy up', it can imply that something will soon be scarce or is in limited supply. 
Fans were worried they wouldn't get tickets, so they tried to buy up as many as they could.