To be fair - the prepackaged thing isn't going to change much if it's #300 in their pick list. If it's anything like the UK, it's a mix of homebrew retailers being swamped (like 10x the orders in some cases), fewer staff (due to self-isolation because they're a vulnerable group or have symptoms, or having to care for children or sick relatives), social distancing in the warehouse disrupting an efficient workflow and it can get worse once it gets in that hands of certain couriers - some next day couriers have been quoting "sometime in the next week" which is obviously not ideal for liquid yeast - and completely out of the hands of the retailer. Most of our homebrew retailers stopped taking orders for a week or so soon after lockdown was declared, just to catch up on all the flood of orders they'd received, then they opened either in small windows during the day, or eg not selling custom amounts of ingredients (which takes more time than pre-packed)
The whole system has been under immense strain, and some retailers have been coping better than others - not necessarily their fault, they generally have small teams and some may have been hit particularly hard by staff self-isolating. So be kind - accept that these are not normal times and accept that they are trying their best, you don't know what's going on behind the scenes.