Possible to have 'sales' on our uploads?

Hi all, as above, is it possible to have 'sales' on the stuff we are selling or would this involve going into each upload separately and changing the price manually?

For example, if I wanted to have a 'sale' and post on my Instagram that all my uploads were 20% off, could I blanket reduce my prices by 20% on Pond5? Or even better, is their an option to offer people promo codes that can be entered at checkout? I haven't ever purchased anything so not sure if this is an option for a buyer currently.

Thanks,

No promo/sales codes, you have to change it manually.